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list of classical problems


ID NAME QUALITY USERS ACC % DIFFICULTY C I
2 Prime Generator   630 83234 16.32
15
14
91 Two squares or not two squares   79 6097 24.70
11
14
134 Phony Primes   1 183 19.22
23
23
526 Divisors   38 1715 43.75
14
13
530 Divisors 2   10 936 52.47
12
16
3107 Odd Numbers of Divisors   27 1072 18.44
22
22
3166 Permutation Exponentiation   36 14.93
3442 The last digit   190 30125 26.99
9
8
3505 Prime Number Theorem   25 1538 28.13
14
13
3591 Patting Heads   3 659 35.33
17
17
3643 Traffic Network   89 2120 18.30
18
21
3871 GCD Extreme   82 3107 29.36
19
26
3932 Point Connection Game in a Circle   3 768 35.47
13
21
4141 Euler Totient Function   147 12043 39.03
8
11
4164 A conjecture of Paul Erdős   25 2699 43.75
16
14
4168 Square-free integers   14 788 46.27
16
21
4523 Binomial Coefficients   210 41.58
23
12
4556 Think I will Buy Me a Football Team   30 2189 45.16
7
11
4839 Ant   3 194 38.89
23
28
4942 Integer Factorization (15 digits)   45 3695 32.76
11
11
5107 Playing with Marbles   7 796 23.69
12
8
5151 Alice’s Cube   8 516 29.30
24
21
5451 Not So Flat After All   9 1128 42.94
11
10
5732 Paradox   43 1241 27.87
16
19
5970 Finding Primes   22 1345 27.95
16
15
5971 LCM Sum   83 3963 26.35
20
29
5978 Frequent Prime Ranges   10 718 28.82
14
14
6221 Increasing Powers of K   4 360 27.59
24
34
6256 Inversion Count   534 18105 32.03
16
18
6264 Rank of a Fraction   4 132 31.92
12
34
6285 Another Game With Numbers   32 1333 31.23
11
13
6288 Treeramids   16 1096 51.97
21
19
6294 Yodaness Level   74 3576 49.31
15
16
6450 PP numbers   10 886 41.94
10
6
6556 N DIV PHI_N   14 749 38.38
5
26
8238 N-Factorful   72 2797 26.81
18
17
9032 Cube Free Numbers   66 4167 31.77
12
11
9385 Strictly not a Prime   9 370 28.68
17
12
10050 Power Tower City   7 148 66.65
26
29
10232 Distinct Primes   85 5932 45.48
10
9
11736 Prime Time   25 2167 48.59
11
12
12005 Grass Planting   11 616 45.51
29
19
12183 Help the Commander in Chief   46 916 29.10
15
16
12241 Classification from Erdős and Selfridge   5 32 19.60
28
28
12933 n-divisors   60 2340 19.39
18
17
13753 Amazing Prime Sequence   62 3362 29.93
10
12
17125 Thor vs Frost Giants   1 190 28.28
39
28
17143 Make Psycho   2 227 25.00
34
9
18202 HUGE GCD   17 687 33.32
14
13
19308 LCM   8 390 18.71
17
24

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