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 80
8
23
30755 Ada and GCD   5 71
26
13
30691 Ada and Diary   25
30737 Ada and Homework   7
32683 Ada and Kohlrabi   2 12
34
9
32059 Ada and Taxes   6 24
20
20
5151 Alice’s Cube   6 428
27
24
10232 Distinct Primes   41 3568
10
8
4556 Think I will Buy Me a Football Team   18 1764
7
13
5451 Not So Flat After All   7 1021
12
8
13753 Amazing Prime Sequence   33 2345
9
12
30826 Bernoulli numbers   2 3
17
17
31066 Number Breaking   3 97
12
12
21357 Crucial Equation   36 2468
3
11
3505 Prime Number Theorem   12 1131
12
15
9032 Cube Free Numbers   31 2892
13
11
526 Divisors   18 1100
17
14
530 Divisors 2   5 654
15
17
22403 Divisors of factorial   43 1022
15
15
74 Divisor Summation   50 11316
7
10
23963 Easy Factorials   8 65
26
26
4141 Euler Totient Function   72 6264
9
12
22382 Euler Totient Function Depth   13 199
12
12
4942 Integer Factorization (15 digits)   18 1800
11
10
33046 Factorial Modulo Prime   2 2
42
34
25584 Factorial Modulo   17 281
9
13
25067 Fibonacci Polynomial   4 64
23
23
5970 Finding Primes   13 866
17
15
6264 Rank of a Fraction   3 108
9
34
5978 Frequent Prime Ranges   4 550
9
6
3871 GCD Extreme   31 806
20
27
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 121
38
17
18202 HUGE GCD   6 389
5
13
4164 A conjecture of Paul Erdős   3 532
6
12
12241 Classification from Erdős and Selfridge   15
27195 Find The Number   4 135
14
11
6221 Increasing Powers of K   293
23
39
6256 Inversion Count   272 9116
15
17
12183 Help the Commander in Chief   19 358
14
17
3442 The last digit   84 15753
9
9
5971 LCM Sum   29 1349
19
30
9385 Strictly not a Prime   4 285
20
15
6450 PP numbers   3 716
17
17
3932 Point Connection Game in a Circle   1 609
17
26
12933 n-divisors   39 1464
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