Catalog
What changed in the pool.
New problems arrive in batches, each time the pool is pinned to a newer revision of the formal-conjectures repository. A solved problem appears again on the day it was marked solved.
26 Oct 2026
23 Oct 2026
16 added
- Berge Fulkerson
- Chvatal Toughness
- Erdos Critical Minimum Degree
- Erdos Purdy Degenerate Quadruples
- Hajos Cycle Decomposition
- Kotzig Perfect Factorization
- Lovasz Hamilton Path
- Marcus Block Permanent
- Marcus De Oliveira
- Minkowski Inhomogeneous Product
- Riddell Erdos Progression Ratio
- Sidon Subset Asymptotic
- Tutte Five Flow
- Tutte Three Flow
- Vizing Independence
- Wang Hadamard Permanent Nonvanishing
12 Oct 2026
8 Oct 2026
7 Oct 2026
16 added
- All positive-index Dirichlet Polya inequalities on convex planar domains
- Complex 3x3 border rank at least 18
- Complex 4x4 exact bilinear multiplication with at most 47 products
- Every degree-at-most-four scalar real polynomial minimal graph is affine, in every dimension
- Every scalar real polynomial minimal graph in dimension eight is affine
- For every dimension n>=8 there is a degree bound uniform over all scalar real polynomial minimal graphs
- Four-speed amended lonely-runner spectrum
- Fourth planar Dirichlet Polya inequality, area times lambda4 at least 16pi
- Graceful degree-4-degree-3 trees
- Graceful three-degree-3 trees
- Six-speed maximum-speed/denominator bound
- Third planar Dirichlet Polya inequality, area times lambda3 at least 12pi
- Two-entry tight lonely-runner classification
- Uniform cubic ordinary-sensitivity upper bound for block sensitivity
- Uniform subquadratic sensitivity-versus-exact-real-degree upper bound
- Wilf inequality for proper numerical semigroups with conductor at most four times multiplicity
6 Oct 2026
1 solved
26 Sept 2026
22 Sept 2026
21 Sept 2026
1 solved
35 added
- Erdős problem 107
- Erdős problem 398
- Riemann Hypothesis
- Artin Primitive Roots Conjecture - part i
- Borsuk Conjecture - four
- Brocard Conjecture
- Bunyakovsky
- Carmichael Totient - charmichael Totient
- Class Number Problem
- Dickson
- Fermat - infinite fermat primes
- Gauss Circle Problem - error is Big O
- Goldbach Conjecture
- Goormaghtigh
- Hadamard
- Hardy Littlewood - first hardy littlewood conjecture
- Hardy Littlewood - second hardy littlewood conjecture
- Idoneal Completeness - idoneal numbers completeness
- Inscribed Square
- Inverse Galois
- Irrational - euler Mascheroni Constant
- Kummer Vandiver
- Legendre Conjecture
- Lehmer Mahler Measure Problem
- Lehmer Totient
- Lemoine
- Mersenne - catalans mersenne conjecture
- Mersenne - infinitely many mersenne primes
- Normality Of Pi - pi normal base ten
- Oppermann
- Perfect Numbers - odd perfect number conjecture
- Pollocks Conjecture - pollock tetrahedral
- Primes And Perfect Squares - infinite prime sq add one
- Regular Primes - regularprime conjecture
- Twin Primes
16 Sept 2026
15 Sept 2026
11 Sept 2026
9 Sept 2026
8 Sept 2026
52 added
- Erdős problem 10
- Erdős problem 14 - part i
- Erdős problem 18 - b
- Erdős problem 25
- Erdős problem 30
- Erdős problem 52
- Erdős problem 61
- Erdős problem 91
- Erdős problem 98
- Erdős problem 124 - ne zero
- Erdős problem 128
- Erdős problem 168 - part ii
- Erdős problem 234
- Erdős problem 263 - part i
- Erdős problem 287
- Erdős problem 291 - shiu heuristic density zero
- Erdős problem 307
- Erdős problem 317 - claim 2
- Erdős problem 323 - part i
- Erdős problem 323 - part ii
- Erdős problem 366
- Erdős problem 386 - two
- Erdős problem 400 - part i
- Erdős problem 410
- Erdős problem 413 - part i
- Erdős problem 495
- Erdős problem 647
- Erdős problem 653
- Erdős problem 681
- Erdős problem 686 - twenty five
- Erdős problem 749
- Erdős problem 770 - part i
- Erdős problem 828
- Erdős problem 886
- Erdős problem 890 - part b
- Erdős problem 930
- Erdős problem 933
- Erdős problem 936 - factorial add one
- Erdős problem 936 - factorial sub one
- Erdős problem 944
- Erdős problem 949
- Erdős problem 950 - part iii
- Erdős problem 962
- Erdős problem 979
- Erdős problem 1056
- Erdős problem 1062 - part ii
- Erdős problem 1082 - part i
- Erdős problem 1101 - part i
- Erdős problem 1113 - filaseta finch kozek
- Erdős problem 1175
- Green's open problem 39
- Green's open problem 47
25 Aug 2026
44 added
- Erdős problem 14 - part ii
- Erdős problem 32
- Erdős problem 50
- Erdős problem 85
- Erdős problem 108
- Erdős problem 145
- Erdős problem 155
- Erdős problem 156
- Erdős problem 200
- Erdős problem 244
- Erdős problem 247
- Erdős problem 323 - k gt 2
- Erdős problem 354 - part i
- Erdős problem 412
- Erdős problem 428
- Erdős problem 458
- Erdős problem 463
- Erdős problem 517
- Erdős problem 600 - part i
- Erdős problem 680 - part ii
- Erdős problem 695 - upper Bound
- Erdős problem 789 - sq
- Erdős problem 812 - part i
- Erdős problem 829
- Erdős problem 873
- Erdős problem 885
- Erdős problem 890 - part a
- Erdős problem 891
- Erdős problem 893
- Erdős problem 931
- Erdős problem 936 - two pow sub one
- Erdős problem 942
- Erdős problem 943
- Erdős problem 950 - part ii
- Erdős problem 951
- Erdős problem 975
- Erdős problem 1057
- Erdős problem 1068
- Erdős problem 1072 - part ii
- Erdős problem 1073
- Erdős problem 1085 - upper d 3
- Erdős problem 1106 - part ii
- Erdős problem 1137
- Erdős problem 1192
13 Aug 2026
1 solved
21 added
- Erdős problem 23
- Erdős problem 39
- Erdős problem 44
- Erdős problem 51
- Erdős problem 66
- Erdős problem 99
- Erdős problem 158
- Erdős problem 238
- Erdős problem 257
- Erdős problem 269 - irrational
- Erdős problem 291 - part i
- Erdős problem 325
- Erdős problem 383
- Erdős problem 445
- Erdős problem 454
- Erdős problem 455
- Erdős problem 579
- Erdős problem 695
- Erdős problem 699
- Erdős problem 726
- Erdős problem 774
5 Aug 2026
106 added
- Erdős problem 9
- Erdős problem 11
- Erdős problem 17
- Erdős problem 28
- Erdős problem 41
- Erdős problem 68
- Erdős problem 82
- Erdős problem 89
- Erdős problem 96
- Erdős problem 100
- Erdős problem 120
- Erdős problem 126 - is Little O
- Erdős problem 137 - multiple powerful factors
- Erdős problem 141 - eleven
- Erdős problem 143 - part ii
- Erdős problem 153
- Erdős problem 196
- Erdős problem 208 - log bound
- Erdős problem 212
- Erdős problem 213
- Erdős problem 218 - ge
- Erdős problem 218 - infinite equal prime gap
- Erdős problem 218 - le
- Erdős problem 233
- Erdős problem 236
- Erdős problem 241 - generalization
- Erdős problem 242 - schinzel generalization
- Erdős problem 243
- Erdős problem 249
- Erdős problem 251
- Erdős problem 264 - part ii
- Erdős problem 272 - szabo strong
- Erdős problem 274 - herzog schonheim
- Erdős problem 313 - primary pseudoperfect are infinite
- Erdős problem 324 - quintic
- Erdős problem 340
- Erdős problem 340 - sub has Pos Density
- Erdős problem 357 - part i
- Erdős problem 357 - infinite set density
- Erdős problem 357 - infinite set sum
- Erdős problem 357 - monotone, part i
- Erdős problem 359 - part i
- Erdős problem 359 - part ii
- Erdős problem 359 - is Good For 1 asymptotic
- Erdős problem 364
- Erdős problem 364 - strong
- Erdős problem 373
- Erdős problem 373 - maximal solution
- Erdős problem 373 - suranyi
- Erdős problem 375
- Erdős problem 376
- Erdős problem 385 - part i
- Erdős problem 396
- Erdős problem 406 - one two
- Erdős problem 409 - sigma termination
- Erdős problem 414
- Erdős problem 416 - part i
- Erdős problem 456 - part iii
- Erdős problem 479
- Erdős problem 535
- Erdős problem 535 - first open case
- Erdős problem 617
- Erdős problem 624
- Erdős problem 672
- Erdős problem 677
- Erdős problem 680 - part i
- Erdős problem 686 - four
- Erdős problem 688 - part ii
- Erdős problem 723 - eq 12
- Erdős problem 770 - three
- Erdős problem 779
- Erdős problem 828 - lehmer conjecture
- Erdős problem 835
- Erdős problem 849
- Erdős problem 853 - part i
- Erdős problem 853 - part ii
- Erdős problem 859
- Erdős problem 889
- Erdős problem 889 - general
- Erdős problem 912
- Erdős problem 912 - tao
- Erdős problem 913 - infinite many 8 p sq sub one primes
- Erdős problem 932
- Erdős problem 936 - two pow add one
- Erdős problem 945
- Erdős problem 950 - part i
- Erdős problem 972
- Erdős problem 982
- Erdős problem 985
- Erdős problem 1003
- Erdős problem 1049
- Erdős problem 1060 - part ii
- Erdős problem 1072 - part i
- Erdős problem 1094
- Erdős problem 1095 - log is Theta
- Erdős problem 1095 - lower conjecture
- Erdős problem 1107
- Erdős problem 1108 - part i
- Erdős problem 1135
- Erdős problem 1142
- Erdős problem 1203
- Erdős problem 1209 - part iii d
- Green's open problem 15
- Green's open problem 24 - conjecture
- Green's open problem 40 - f two eq one
- Green's open problem 51 - one half