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list of classical problems (unsolved)


ID NAME QUALITY USERS ACC % DIFFICULTY C I
41834 Anagrams and GCD   10 6.08
41890 Anagrams and Divisibility   1 9 5.17
34
34
16243 Anagrams   2 260 25.34
17
12
13768 An Experiment by Penny   8 607 59.70
6
15
26646 An easy Problem   8 69 55.22
13
21
11931 AMZ Word   12 1709 64.77
9
10
11932 Amz Rock   13 1785 61.76
4
7
11354 Amusing numbers   53 3254 59.78
13
15
13096 Amr Samir   5 921 31.21
9
10
10450 Amoeba   101 17.24
40667 Ambitious XOXO   6 47 51.05
11
15
1673 Ambitious Manager   4 464 36.31
17
15
379 Ambiguous Permutations   71 12377 59.61
4
5
2171 Ambiguous Codes   1 85 39.47
19975 Amazing Prime Sequence (hard)   5 97 44.55
39
45
13753 Amazing Prime Sequence   62 3362 29.93
10
12
11472 Amazing Maze   5 262 28.97
17
26
14168 Amazing Factor Sequence (medium)   9 231 29.52
21
24
33039 Amazing Factor Sequence (hard)   2 23 60.27
50
50
14138 Amazing Factor Sequence   38 2351 37.25
11
12
4188 Amazing equality   43 14.08
25471 AM FM   2 39 12.31
17
34
17267 Alturas de NoMeAcuerdo   2 80 63.36
17
14
27307 Alternating Sequences   62 2127 32.62
8
9
5830 Alternating Permutations   1 65 39.22
34
34
8759 Alpine Skiing   1 54 38.37
394 Alphacode   580 22983 27.42
15
15
29461 Alphabetic Rope3   4 150 56.67
34
26
29458 Alphabetic Rope2   2 123 49.85
34
34
29455 Alphabetic Rope   7 238 36.15
20
13
10105 Alphabet Soup   31 42.57
359 Alpha Centauri Tennis   2 1755 50.27
3
8
14761 Almost-isosceles Pythagorean triple (easy)   1 67 41.93
7947 Almost square factorisation   5 123 52.29
8
11
3405 Almost Shortest Path   79 1714 31.37
22
21
26771 Almost Prime Numbers Again   17 332 19.57
24
20
34482 Allowed Factors   4 77 27.64
14
27
14844 All Your Base   12 543 30.17
11
11
12107 All Possible Barns   1 34 25.23
34
34
10283 ALL IZZ WELL   70 3493 31.36
17
14
31591 All in One   8 110 8.90
31
26
1774 All Discs Considered   10 523 28.49
24
20
26703 All about Sorting!   10 87 42.28
16
17
10471 Aliens at the train, again!   28 815 44.66
16
16
10401 Aliens at the train   85 4483 29.27
13
10
11789 Aliens at the subway   2 78 18.13
23
23
145 Aliens   2 436 30.02
34
42
32940 Alien Language   2 74 40.77
28
34
8651 Alien arithmetic   1 45 18.37
26445 Alicias Afternoon Amble   11 189 57.07
20
26

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