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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
28457 Correlations   5 94 29.40
9
13
28798 Yet Another Xor Sequence   9 116 46.56
9
13
32683 Ada and Kohlrabi   5 73 19.22
30
13
34260 Signpost reading   8 28 20.41
21
13
34622 NICE SEQUENCES   17 165 50.66
11
13
36712 Trailing digits   7 62 12.73
13
13
40808 Crowded Music Festival   9 49 49.22
7
13
41128 Pierwiastkowanie   4 40 39.50
5
13
16245 Living with Courage   20 580 37.60
10
13
12471 DIE HARD   157 7987 38.69
12
13
526 Divisors   38 1715 43.75
14
13
2 Prime Generator   630 83244 16.32
15
14
14956 Submerging Islands   107 4729 39.71
13
14
11814 Eko   172 16739 26.94
14
14
32 A Needle in the Haystack   193 11383 38.38
15
14
2852 Broken Keyboard   19 1220 31.73
14
14
5978 Frequent Prime Ranges   10 718 28.82
14
14
12260 Devlali Numbers   13 726 37.85
20
14
14441 Three Circle Problem (EASY)   13 2025 55.69
6
14
27320 Card Game   13 359 38.80
9
14
302 Count on Cantor   155 13081 61.26
13
14
7150 Palindrome 2000   57 3304 27.64
14
14
16487 Update the array !   165 5029 38.78
9
14
3878 Rectangles Perimeter   58 2702 49.87
12
14
11402 The Indian Connection   19 2298 36.29
8
14
16281 War   13 1107 48.10
8
14
23153 Equivalent Passwords   9 77 36.16
21
14
27487 Police Men   10 309 44.28
14
14
34502 ZERO TRIPLET   12 84 16.11
17
14
31040 Namit In Trouble   21 869 23.79
14
14
91 Two squares or not two squares   79 6097 24.70
11
14
10283 ALL IZZ WELL   70 3493 31.36
17
14
10500 Haybale stacking   24 4042 34.76
9
14
27225 Knight Move   12 466 30.10
15
14
381 106 miles to Chicago   50 3222 36.51
15
14
3033 Help the soldier   18 1253 29.00
12
14
20063 Large subsequence Problem   20 453 42.16
10
14
27381 Emoticon   27 865 49.86
8
14
4564 Chop Ahoy! Revisited!   55 2968 50.84
12
14
10394 Buying Apples!   73 5618 34.87
12
14
26054 BMW   21 691 16.40
14
14
4033 Phone List   151 7337 31.82
16
14
56 Dyzio   8 1225 31.47
11
14
260 Containers   3 298 46.22
17
14
413 Word Puzzles   4 377 18.26
30
14
3379 String Shuffle   7 400 65.69
17
14
3882 Cijevi   5 261 38.20
30
14
4164 A conjecture of Paul ErdÅ‘s   25 2699 43.75
16
14
7132 Headshot   7 1407 37.40
8
14
8044 Fantastic Discovery   3 314 42.70
14
14

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