ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   2 22
1
26
32029 Ada and Connections   2 16
17
17
32840 Ada and Digits   5 30
21
21
32949 Ada and Digits 2   2 21
26
26
30739 Ada and Manure   8 87
8
23
30755 Ada and GCD   6 83
24
14
30691 Ada and Diary   25
30737 Ada and Homework   7
32683 Ada and Kohlrabi   2 16
34
9
32059 Ada and Taxes   6 26
20
20
5151 Alice’s Cube   6 432
27
24
10232 Distinct Primes   45 3639
10
9
4556 Think I will Buy Me a Football Team   19 1797
7
12
5451 Not So Flat After All   7 1025
12
8
13753 Amazing Prime Sequence   33 2373
9
12
30826 Bernoulli numbers   2 3
17
17
31066 Number Breaking   3 107
11
11
21357 Crucial Equation   35 2520
3
10
3505 Prime Number Theorem   14 1152
11
14
9032 Cube Free Numbers   32 2938
13
12
526 Divisors   20 1120
17
13
530 Divisors 2   5 667
15
17
22403 Divisors of factorial   44 1053
15
15
74 Divisor Summation   53 11465
7
10
23963 Easy Factorials   10 68
28
28
4141 Euler Totient Function   75 6402
8
12
22382 Euler Totient Function Depth   16 214
14
14
4942 Integer Factorization (15 digits)   19 1853
11
10
33046 Factorial Modulo Prime   2 2
42
34
25584 Factorial Modulo   17 283
9
13
25067 Fibonacci Polynomial   5 84
23
23
5970 Finding Primes   15 883
18
16
6264 Rank of a Fraction   3 108
9
34
5978 Frequent Prime Ranges   4 557
9
6
3871 GCD Extreme   34 851
21
27
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 123
38
17
18202 HUGE GCD   7 395
8
14
4164 A conjecture of Paul Erdős   3 541
9
13
12241 Classification from Erdős and Selfridge   1 16
17
17
27195 Find The Number   3 140
14
11
6221 Increasing Powers of K   1 297
26
34
6256 Inversion Count   283 9325
15
17
12183 Help the Commander in Chief   19 366
14
17
3442 The last digit   87 15956
9
9
5971 LCM Sum   33 1396
20
30
9385 Strictly not a Prime   4 287
20
15
6450 PP numbers   3 732
17
17
3932 Point Connection Game in a Circle   1 619
17
26
12933 n-divisors   39 1491
18
17

#number-theory

The problem involves number theory, a branch of pure mathematics

https://en.wikipedia.org/wiki/Number_theory http://mathworld.wolfram.com/NumberTheory.html http://www.math.brown.edu/~jhs/frintch1ch6.pdf http://www.britannica.com/topic/number-theory