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All Random Solved Random Open
This is a list of the problem lists that Erdős wrote, in chronological order. The problem count reflects how many problems in this database appear in that paper. The order in which these problems appear in the database may not correlate at all with the order they are presented in the paper.

Papers with a green background have been completely checked, and so the database should contain all problems in that paper. There remain many problem lists of Erdős that have only been partially, if at all, checked against this database. One day, hopefully, all of the problems in the lists below will have been entered into this database. One purpose of this list to show where the work remains to be done.

I believe this list is complete; if you know of a problem list (i.e. a paper (co)written by Erdős whose main purpose is to discuss open problems) not on the list please let me know.

There are 140 lists, of which 9 are completely checked.

12 problems
(5 solved)
Some problems on the distribution of prime numbers
C.I.M.E., Teoria dei numeri (1955)
11 problems
(2 solved)
Problems and results in additive number theory
Colloque sur la Théorie des Nombres, Bruxelles, 1955 127-137 (1956) MR 0079027
29 problems
(16 solved)
Some unsolved problems
Michigan Math. J. 291-300 (1957) MR 98702
0 problems
(0 solved)
Über einige Probleme der additiven Zahlentheorie
Sammelband zu Ehren des 250. Geburtstages Leonhard Eulers 116-119 (1959) MR 176972
107 problems
(46 solved)
Some unsolved problems
Magyar Tud. Akad. Mat. Kutató Int. Közl. 221-254 (1961) MR 177846
0 problems
(0 solved)
Quelques problémes de théorie des nombres
Monographies de L'Enseignement Mathématique, No. 6 81-135 (1963) MR 158847
0 problems
(0 solved)
Problems and results on diophantine approximations
Compositio Math. 52-65 (1964) MR 179131
1 problem
(0 solved)
Extremal problems in graph theory
Theory of Graphs and its Applications (Proc. Sympos. Smolenice, 1963) 29-36 (1964) MR 180500
0 problems
(0 solved)
Extremal problems in number theory
Proc. Sympos. Pure Math., Vol. VIII 181-189 (1965) MR 174539
0 problems
(0 solved)
Some recent advances and current problems in number theory
Lectures on Modern Mathematics, Vol. III 196-244 (1965) MR 177933
0 problems
(0 solved)
Problems and results on the convergence and divergence properties of the Lagrange interpolation polynomials and some extremal problems
Mathematica (Cluj) 65-73 (1967) MR 233114
0 problems
(0 solved)
Extremal problems in graph theory
A Seminar on Graph Theory 54-59 (1967) MR 223263
0 problems
(0 solved)
Some applications of graph theory to number theory
The Many Facets of Graph Theory (Proc. Conf., Western Mich. Univ., Kalamazoo, Mich., 1968) 77-82 (1969) MR 250917
0 problems
(0 solved)
Problems and results in chromatic graph theory
Proof Techniques in Graph Theory (Proc. Second Ann Arbor Graph Theory Conf., Ann Arbor, Mich., 1968) 27-35 (1969) MR 252273
0 problems
(0 solved)
Some extremal problems in combinatorial number theory
Mathematical Essays Dedicated to A. J. Macintyre 123-133 (1970) MR 276194
1 problem
(0 solved)
Some extremal problems in graph theory
Combinatorial theory and its applications, I-III (Proc. Colloq., Balatonfüred, 1969) 377-390 (1970) MR 300924
0 problems
(0 solved)
Some applications of graph theory to number theory
Proc. Second Chapel Hill Conf. on Combinatorial Mathematics and its Applications (Univ. North Carolina, Chapel Hill, N.C., 1970) 136-145 (1970) MR 266845
0 problems
(0 solved)
Some problems in additive number theory
Amer. Math. Monthly 619-621 (1970) MR 268141
0 problems
(0 solved)
Problems in combinatorial set theory
Combinatorial Structures and their Applications (Proc. Calgary Internat. Conf., Calgary, Alta., 1969) 97-100 (1970) MR 263640
0 problems
(0 solved)
Problems and results in finite and infinite combinatorial analysis
Ann. New York Acad. Sci. 115-124 (1970) MR 263675
1 problem
(0 solved)
Some unsolved problems in graph theory and combinatorial analysis
Combinatorial Mathematics and its Applications (Proc. Conf., Oxford, 1969) 97-109 (1971) MR 0277392
0 problems
(0 solved)
Problems and results in combinatorial analysis
Combinatorics (Proc. Sympos. Pure Math., Vol. XIX, Univ. California, Los Angeles, Calif., 1968) 77-89 (1971) MR 432462
0 problems
(0 solved)
Unsolved problems in set theory
Axiomatic Set Theory (Proc. Sympos. Pure Math., Vol. XIII, Part I, Univ. California, Los Angeles, Calif., 1967) 17-48 (1971) MR 280381
0 problems
(0 solved)
Extremal problems in number theory
Proceedings of the 1972 Number Theory Conference (Univ. Colorado, Boulder, Colo.) 80-86 (1972) MR 392900
35 problems
(12 solved)
Problems and results on combinatorial number theory
A survey of combinatorial theory (Proc. Internat. Sympos., Colorado State Univ., Fort Collins, Colo., 1971) 117-138 (1973) MR 0360509
0 problems
(0 solved)
Résultats et problémes en théorie des nombres
Séminaire Delange-Pisot-Poitou (14e année: 1972/73), Théorie des nombres, Fasc. 2 Exp. No. 24, 7 (1973) MR 396376
0 problems
(0 solved)
Some problems in graph theory
Hypergraph Seminar (Proc. First Working Sem., Ohio State Univ., Columbus, Ohio, 1972; dedicated to Arnold Ross) 187-190 (1974) MR 379287
0 problems
(0 solved)
Remarks on some problems in number theory
Math. Balkanica 197-202 (1974) MR 429704
0 problems
(0 solved)
Unsolved and solved problems in set theory
Proceedings of the Tarski Symposium (Proc. Sympos. Pure Math., Vol. XXV, Univ. California, Berkeley, Calif., 1971) 269-287 (1974) MR 357122
2 problems
(1 solved)
Some recent progress on extremal problems in graph theory
Congr. Numer. 3-14 (1975)
0 problems
(0 solved)
Problems and results in combinatorial number theory
Journées Arithmétiques de Bordeaux (Conf., Univ. Bordeaux, Bordeaux, 1974) 295-310 (1975) MR 0374075
2 problems
(1 solved)
Problems and results on finite and infinite graphs
Recent advances in graph theory (Proc. Second Czechoslovak Sympos., Prague, 1974) 183-192. (loose errata) (1975) MR 389669
0 problems
(0 solved)
Problems and results on finite and infinite combinatorial analysis
Infinite and finite sets (Colloq., Keszthely, 1973; dedicated to P. Erdős on his 60th birthday), Vols. I, II, III 403-424 (1975) MR 389607
0 problems
(0 solved)
On some problems of elementary and combinatorial geometry
Ann. Mat. Pura Appl. (4) 99-108 (1975) MR 411984
0 problems
(0 solved)
Problems and results on Diophantine approximations. II
Répartition modulo 1 (Actes Colloq., Marseille-Luminy, 1974) 89-99 (1975) MR 412138
2 problems
(1 solved)
Problems and results in combinatorial analysis
Colloquio Internazionale sulle Teorie Combinatorie (Roma, 1973), Tomo II 3-17 (1976) MR 0465878
2 problems
(0 solved)
Problems and results in graph theory and combinatorial analysis
Proceedings of the Fifth British Combinatorial Conference (Univ. Aberdeen, Aberdeen, 1975) 169-192 (1976) MR 409246
0 problems
(0 solved)
Some recent problems and results in graph theory, combinatorics and number theory
Proceedings of the Seventh Southeastern Conference on Combinatorics, Graph Theory, and Computing (Louisiana State Univ., Baton Rouge, La., 1976) 3-14 (1976) MR 422031
0 problems
(0 solved)
Problems and results on number theoretic properties of consecutive integers and related questions
Proceedings of the Fifth Manitoba Conference on Numerical Mathematics (Univ. Manitoba, Winnipeg, Man., 1975) 25-44 (1976) MR 422146
0 problems
(0 solved)
Problems and results on consecutive integers
Publ. Math. Debrecen 271-282 (1976) MR 453671
0 problems
(0 solved)
Extremal problems on polynomials
Approximation theory, II (Proc. Internat. Sympos., Univ. Texas, Austin, Tex., 1976) 347-355 (1976) MR 477003
0 problems
(0 solved)
Problems and results on combinatorial number theory. II
J. Indian Math. Soc. (N.S.) 285-298 (1976) MR 444552
1 problem
(1 solved)
Problems in number theory and combinatorics
Proceedings of the Sixth Manitoba Conference on Numerical Mathematics (Univ. Manitoba, Winnipeg, Man., 1976) 35-58 (1977) MR 532690
0 problems
(0 solved)
Problems and results in combinatorial analysis
Proceedings of the Eighth Southeastern Conference on Combinatorics, Graph Theory and Computing (Louisiana State Univ., Baton Rouge, La., 1977) 3-12 (1977) MR 542437
0 problems
(0 solved)
Problems and results on combinatorial number theory. III
Number theory day (Proc. Conf., Rockefeller Univ., New York, 1976) 43-72 (1977) MR 472752
0 problems
(0 solved)
Problémes extrémaux et combinatoires en théorie des nombres
Séminaire Delange-Pisot-Poitou, 17e année: 1975/76, Théorie des nombres: Fasc. 2 Exp. No. G7, 5 (1977) MR 554189
0 problems
(0 solved)
Problems and results in combinatorial analysis and combinatorial number theory
Proceedings of the Ninth Southeastern Conference on Combinatorics, Graph Theory, and Computing (Florida Atlantic Univ., Boca Raton, Fla., 1978) 29-40 (1978) MR 527930
0 problems
(0 solved)
Problems and results in graph theory and combinatorial analysis
Problémes combinatoires et théorie des graphes (Colloq. Internat. CNRS, Univ. Orsay, Orsay, 1976) 127-129 (1978) MR 539958
0 problems
(0 solved)
Some more problems on elementary geometry
Austral. Math. Soc. Gaz. 52-54 (1978) MR 509363
0 problems
(0 solved)
Set-theoretic, measure-theoretic, combinatorial, and number-theoretic problems concerning point sets in Euclidean space
Real Anal. Exchange 113-138 (1978/79) MR 533932
0 problems
(0 solved)
Some extremal problems on families of graphs and related problems
Combinatorial mathematics (Proc. Internat. Conf. Combinatorial Theory, Australian Nat. Univ., Canberra, 1977) 13-21 (1978) MR 526725
0 problems
(0 solved)
On some unusual nonconventional problems in additive number theory
Mat. Lapok 9-14 (1978/82) MR 734602
0 problems
(0 solved)
Some solved and unsolved problems in combinatorial number theory
Math. Slovaca 407-421 (1978) MR 534819
0 problems
(0 solved)
Some number theoretic problems on binomial coefficients
Austral. Math. Soc. Gaz. 97-99 (1978) MR 519358
1 problem
(1 solved)
Some unconventional problems in number theory
Astérisque 73-82 (1979) MR 556666
1 problem
(0 solved)
Problems and results in graph theory and combinatorial analysis
Graph theory and related topics (Proc. Conf., Univ. Waterloo, Waterloo, Ont., 1977) 153-163 (1979) MR 538043
0 problems
(0 solved)
Old and new problems in combinatorial analysis and graph theory
Second International Conference on Combinatorial Mathematics (New York, 1978) 177-187 (1979) MR 556022
0 problems
(0 solved)
Some unconventional problems in number theory
Acta Math. Acad. Sci. Hungar. 71-80 (1979) MR 515121
0 problems
(0 solved)
Some unconventional problems in number theory
Math. Mag. 67-70 (1979) MR 527408
0 problems
(0 solved)
Combinatorial problems in geometry and number theory
Relations between combinatorics and other parts of mathematics (Proc. Sympos. Pure Math., Ohio State Univ., Columbus, Ohio, 1978) 149-162 (1979) MR 525325
0 problems
(0 solved)
Some old and new problems in various branches of combinatorics
Proceedings of the Tenth Southeastern Conference on Combinatorics, Graph Theory and Computing (Florida Atlantic Univ., Boca Raton, Fla., 1979) 19-37 (1979) MR 561032
28 problems
(10 solved)
Old and new problems and results in combinatorial number theory: van der Waerden's theorem and related topics
Enseign. Math. 325-344 (1979) MR 0570317
0 problems
(0 solved)
A survey of problems in combinatorial number theory
Ann. Discrete Math. 89-115 (1980) MR 593525
0 problems
(0 solved)
Problems and results in number theory and graph theory
Proceedings of the Ninth Manitoba Conference on Numerical Mathematics and Computing (Univ. Manitoba, Winnipeg, Man., 1979) 3-21 (1980) MR 593699
0 problems
(0 solved)
Nine little known problems in combinatorial number theory
Normat 155-164, 180 (1980) MR 597617
0 problems
(0 solved)
Some combinational problems in geometry
Geometry and differential geometry (Proc. Conf., Univ. Haifa, Haifa, 1979) 46-53 (1980) MR 585852
295 problems
(75 solved)
Old and new problems and results in combinatorial number theory
Monographies de L'Enseignement Mathematique (1980) MR 0592420
1 problem
(0 solved)
On the combinatorial problems which I would most like to see solved
Combinatorica 25-42 (1981) MR 602413
1 problem
(0 solved)
My Scottish Book 'Problems'
The Scottish Book 35-43 (1981)
6 problems
(1 solved)
Some new problems and results in graph theory and other branches of combinatorial mathematics
Combinatorics and graph theory 9-17 (1981) MR 593525
1 problem
(0 solved)
Some applications of graph theory and combinatorial methods to number theory and geometry
Algebraic methods in graph theory, Vol. I, II (Szeged, 1978) 137-148 (1981) MR 642037
1 problem
(0 solved)
Problems and results in graph theory
The theory and applications of graphs (Kalamazoo, Mich., 1980) 331-341 (1981) MR 634537
0 problems
(0 solved)
Problems and results on finite and infinite combinatorial analysis. II
Enseign. Math. (2) 163-176 (1981) MR 630965
0 problems
(0 solved)
Many old and on some new problems of mine in number theory
Congr. Numer. 3-27 (1981) MR 635934
0 problems
(0 solved)
Some problems and results on additive and multiplicative number theory
Analytic number theory (Philadelphia, Pa., 1980) 171-182 (1981) MR 654526
0 problems
(0 solved)
Some new problems and results in graph theory and other branches of combinatorial mathematics
Combinatorics and graph theory (Calcutta, 1980) 9-17 (1981) MR 655605
0 problems
(0 solved)
Solved and unsolved problems in combinatorics and combinatorial number theory
Congr. Numer. 49-62 (1981) MR 681869
0 problems
(0 solved)
Problems and results in number theory
Recent progress in analytic number theory, Vol. 1 (Durham, 1979) 1-13 (1981) MR 637339
0 problems
(0 solved)
Problems and results on finite and infinite combinatorial analysis. II
Logic and algorithmic (Zurich, 1980) 131-144 (1982) MR 648300
0 problems
(0 solved)
Problems and results on block designs and set systems
Congr. Numer. 3-16 (1982) MR 725865
0 problems
(0 solved)
Miscellaneous problems in number theory
Congr. Numer. 25-45 (1982) MR 681700
0 problems
(0 solved)
Some new problems and results in number theory
Number theory (Mysore, 1981) 50-74 (1982) MR 665438
0 problems
(0 solved)
Some remarks and problems in number theory related to the work of Euler
Math. Mag. 292-298 (1983) MR 720650
1 problem
(0 solved)
On some of my conjectures in number theory and combinatorics
Proceedings of the fourteenth Southeastern conference on combinatorics, graph theory and computing (Boca Raton, Fla., 1983) 3-19 (1983) MR 734525
17 problems
(6 solved)
Combinatorial problems in geometry
Math. Chronicle 35-54 (1983) MR 706025
6 problems
(3 solved)
Research problems
Period. Math. Hungar. 101-103 (1984) MR 1553627
0 problems
(0 solved)
On some problems in graph theory, combinatorial analysis and combinatorial number theory
Graph theory and combinatorics (Cambridge, 1983) 1-17 (1984) MR 777160
0 problems
(0 solved)
Some old and new problems in combinatorial geometry
Convexity and graph theory (Jerusalem, 1981) 129-136 (1984) MR 791022
1 problem
(0 solved)
Extremal problems in number theory, combinatorics and geometry
Proceedings of the International Congress of Mathematicians, Vol. 1, 2 (Warsaw, 1983) 51-70 (1984) MR 804676
2 problems
(1 solved)
On some problems in graph theory, combinatorial analysis and combinatorial number theory
Graph theory and combinatorics (Cambridge, 1983) 1-17 (1984) MR 777160
0 problems
(0 solved)
Some new and old problems on chromatic graphs
Combinatorics and applications (Calcutta, 1982) 118-126 (1984) MR 852032
8 problems
(3 solved)
Problems and results in combinatorial geometry
Discrete geometry and convexity (New York, 1982) 1-11 (1985) MR 809186
0 problems
(0 solved)
Problems and results on chromatic numbers in finite and infinite graphs
Graph theory with applications to algorithms and computer science (Kalamazoo, Mich., 1984) 201-213 (1985) MR 812666
0 problems
(0 solved)
On some of my problems in number theory I would most like to see solved
Number theory (Ootacamund, 1984) 74-84 (1985) MR 797781
0 problems
(0 solved)
Some of my old and new problems in elementary number theory and geometry
Proceedings of the Sundance conference on combinatorics and related topics (Sundance, Utah, 1985) 97-106 (1985) MR 833541
0 problems
(0 solved)
Some problems and results in number theory
Number theory and combinatorics. Japan 1984 (Tokyo, Okayama and Kyoto, 1984) 65-87 (1985) MR 827779
0 problems
(0 solved)
Some solved and unsolved problems of mine in number theory
Topics in analytic number theory (Austin, Tex., 1982) 59-75 (1985) MR 804242
0 problems
(0 solved)
Some problems on number theory
Proceedings of the seventeenth Southeastern international conference on combinatorics, graph theory, and computing (Boca Raton, Fla., 1986) 225-244 (1986) MR 885283
18 problems
(2 solved)
Some problems on finite and infinite graphs
Logic and combinatorics (Arcata, Calif., 1985) 223-228 (1987) MR 891250
0 problems
(0 solved)
Some combinatorial and metric problems in geometry
Intuitive geometry (Siófok, 1985) 167-177 (1987) MR 910710
0 problems
(0 solved)
Problems and results on minimal bases in additive number theory
Number theory (New York, 1984-1985) 87-96 (1987) MR 894505
6 problems
(0 solved)
Problems and results in combinatorial analysis and graph theory
Discrete Math. 81-92 (1988)
0 problems
(0 solved)
Some old and new problems in combinatorial geometry
Applications of discrete mathematics (Clemson, SC, 1986) 32-37 (1988) MR 974622
0 problems
(0 solved)
On the irrationality of certain series: problems and results
New advances in transcendence theory (Durham, 1986) 102-109 (1988) MR 971997
2 problems
(1 solved)
Some Problems and Results on Combinatorial Number Theory
Annals of the New York Academy of Sciences 132-145 (1989) MR 1110810
0 problems
(0 solved)
On some problems and results in elementary number theory
Sichuan Daxue Xuebao 1-6 (1989) MR 1059667
0 problems
(0 solved)
Problems and results on extremal problems in number theory, geometry, and combinatorics
Proceedings of the 7th Fischland Colloquium, I (Wustrow, 1988) 6-14 (1989) MR 1050324
0 problems
(0 solved)
Some old and new problems on additive and combinatorial number theory
Combinatorial Mathematics: Proceedings of the Third International Conference (New York, 1985) 181-186 (1989) MR 1018622
50 problems
(18 solved)
Some of my favourite unsolved problems
A tribute to Paul Erdős 467-478 (1990) MR 1117038
6 problems
(1 solved)
Problems and results on graphs and hypergraphs: similarities and differences
Mathematics of Ramsey theory 12-28 (1990) MR 1083590
2 problems
(2 solved)
Some recent combinatorial problems
Technical Report, University of Bielefeld (1990)
0 problems
(0 solved)
On some of my favourite problems in graph theory and block designs
Matematiche (Catania) 61-73 (1990) MR 1180999
0 problems
(0 solved)
Some of my old and new combinatorial problems
Paths, flows, and VLSI-layout (Bonn, 1988) 35-45 (1990) MR 1083376
2 problems
(1 solved)
Problems and results in combinatorial analysis and combinatorial number theory
Graph theory, combinatorics, and applications, Vol. 1 (Kalamazoo, MI, 1988) 397-406 (1991) MR 1170793
0 problems
(0 solved)
Problems and results on polynomials and interpolation
Approximation theory (Kecskemét, 1990) 253-261 (1991) MR 1211436
0 problems
(0 solved)
On some unsolved problems in elementary geometry
Mat. Lapok (N.S.) 1-10 (1992) MR 1273073
0 problems
(0 solved)
Some of my favourite problems in various branches of combinatorics
Matematiche (Catania) 231-240 (1992) MR 1275857
0 problems
(0 solved)
Some of my forgotten problems in number theory
Hardy-Ramanujan J. 34-50 (1992) MR 1215590
0 problems
(0 solved)
On some of my favourite problems in various branches of combinatorics
Fourth Czechoslovakian Symposium on Combinatorics, Graphs and Complexity (Prachatice, 1990) 69-79 (1992) MR 1206246
0 problems
(0 solved)
Some of my favorite solved and unsolved problems in graph theory
Quaestiones Math. 333-350 (1993) MR 1254162
1 problem
(0 solved)
Some problems and results in cochromatic theory
Quo vadis, graph theory? 261-264 (1993) MR 1217997
2 problems
(0 solved)
Problems and results on set systems and hypergraphs
Extremal problems for finite sets (Visegrád, 1991) 217-227 (1994) MR 1319165
0 problems
(0 solved)
Some problems in number theory, combinatorics and combinatorial geometry
Math. Pannon. 261-269 (1994) MR 1304854
0 problems
(0 solved)
Problems and results in discrete mathematics
Discrete Math. 53-73 (1994) MR 1313281
72 problems
(25 solved)
Some of my favourite problems in number theory, combinatorics, and geometry
Resenhas 165-186 (1995) MR 1370501
0 problems
(0 solved)
Some of my recent problems in combinatorial number theory, geometry and combinatorics
Graph theory, combinatorics, and algorithms, Vol. 1, 2 (Kalamazoo, MI, 1992) 335-349 (1995) MR 1405821
0 problems
(0 solved)
Some problems in number theory
Octogon Math. Mag. 3-5 (1995) MR 1374981
0 problems
(0 solved)
On some problems in combinatorial set theory
Publ. Inst. Math. (Beograd) (N.S.) 61-65 (1995) MR 1387354
0 problems
(0 solved)
Some old and new problems in approximation theory: research problems 95-1
Constr. Approx. 419-421 (1995) MR 1350678
1 problem
(1 solved)
Extremal problems in combinatorial geometry
Handbook of combinatorics, Vol. 1, 2 809-874 (1995) MR 1373673
0 problems
(0 solved)
Some of my favourite problems on cycles and colourings
Tatra Mt. Math. Publ. 7-9 (1996) MR 1402943
0 problems
(0 solved)
Some problems I presented or planned to present in my short talk
Analytic number theory, Vol. 1 (Allerton Park, IL, 1995) 333-335 (1996) MR 1399346
18 problems
(5 solved)
Problems in number theory
New Zealand J. Math. 155-160 (1997) MR 1601631
21 problems
(6 solved)
Some old and new problems in various branches of combinatorics
Discrete Math. 227-231 (1997) MR 1439273
44 problems
(15 solved)
Some of my favorite problems and results
The mathematics of Paul Erdős, I 47-67 (1997) MR 1425174
1 problem
(0 solved)
Some recent problems and results in graph theory
Discrete Math. 81-85 (1997) MR 1432220
0 problems
(0 solved)
Some of my favourite unsolved problems
Math. Japon. 527-537 (1997) MR 1487304
0 problems
(0 solved)
Some unsolved problems
Combinatorics, geometry and probability (Cambridge, 1993) 1-10 (1997) MR 1476428
0 problems
(0 solved)
Some of my new and almost new problems and results in combinatorial number theory
Number theory (Eger, 1996) 169-180 (1998) MR 1628841
12 problems
(0 solved)
A selection of problems and results in combinatorics
Combin. Probab. Comput. 1-6 (1999) MR 1684620