ID NAME QUALITY USERS ACC % DIFFICULTY C I
18164 Atoms in the Lab   31 3664
7
5
328 Bishops   82 8577
14
7
2009 Cryptography   1 130
1
34
314 Digits of e   3 2965
1
1
24 Small factorials   152 44502
15
9
6236 Matches   8 443
26
7
36563 Hard Fibonacci   6 69
20
22
2906 GCD2   59 6420
12
11
2901 One Geometry Problem   9 1714
4
13
10676 0110SS   25 1707
13
9
54 Julka   160 21065
19
6
5699 The last digit re-visited   39 7359
9
9
3932 Point Connection Game in a Circle   3 722
13
21
3970 Convert to Decimal Base System   53
17
17
16034 Minimum Number   5 486
11
1
3023 Binary multiplication   3 226
17
17
35954 New Data Type   -1 114
5
5
18905 Kapti and Balu   1 34
17
17
8676 Digits of Phi (Golden Ratio)   2 290
17
17
270 Digits of Pi   12 5828
9
19
5294 Recurrence   2 250
28
17
29748 Robin Hood   27
1
1
3362 Setnja   2 234
9
17
10334 SOLDIERS   6 710
9
4
1423 Digits of SQRT(2)   6 2717
11
11
738 Another Counting Problem   1 223
71 Tree   3 423
12
9
1002 Uncle Jack   13 2936
9
8
235 Very Fast Multiplication   22 1156
26
22
6479 The Very Greatest Common Divisor   4 88
21
13
1475 Play with Digit Seven   3 108
34
14

#big-numbers

The problem involves arbitrary precision arithmetic

https://en.wikipedia.org/wiki/Arbitrary-precision_arithmetic https://en.wikipedia.org/wiki/Karatsuba_algorithm - efficient multiplication algorithm https://en.wikipedia.org/wiki/Toom%E2%80%93Cook_multiplication - as above https://en.wikipedia.org/wiki/Sch%C3%B6nhage%E2%80%93Strassen_algorithm - as above https://en.wikipedia.org/wiki/F%C3%BCrer%27s_algorithm - as above