ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   2 16
1
26
32029 Ada and Connections   1 13
17
17
32840 Ada and Digits   5 19
17
17
32949 Ada and Digits 2   1 12
17
17
30739 Ada and Manure   8 71
8
23
30755 Ada and GCD   5 61
26
13
30691 Ada and Diary   22
30737 Ada and Homework   5
32683 Ada and Kohlrabi   2 8
34
9
32059 Ada and Taxes   5 19
21
21
5151 Alice’s Cube   6 418
27
24
10232 Distinct Primes   37 3442
9
8
4556 Think I will Buy Me a Football Team   17 1740
8
14
5451 Not So Flat After All   7 1015
12
8
13753 Amazing Prime Sequence   31 2269
10
12
30826 Bernoulli numbers   2 3
17
17
31066 Number Breaking   2 78
12
12
21357 Crucial Equation   32 2338
4
11
3505 Prime Number Theorem   12 1111
13
15
9032 Cube Free Numbers   31 2791
13
11
526 Divisors   16 1071
17
15
530 Divisors 2   4 639
15
17
22403 Divisors of factorial   41 978
14
14
74 Divisor Summation   48 11095
7
10
23963 Easy Factorials   8 64
26
26
4141 Euler Totient Function   68 6068
8
12
22382 Euler Totient Function Depth   13 189
12
12
4942 Integer Factorization (15 digits)   17 1764
11
9
33046 Factorial Modulo Prime   2 2
42
34
25584 Factorial Modulo   17 279
9
13
25067 Fibonacci Polynomial   4 57
23
23
5970 Finding Primes   13 818
17
15
6264 Rank of a Fraction   1 106
9
34
5978 Frequent Prime Ranges   4 544
9
6
3871 GCD Extreme   29 748
20
28
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 114
38
17
18202 HUGE GCD   5 364
5
13
4164 A conjecture of Paul Erdős   2 514
1
9
12241 Classification from Erdős and Selfridge   15
27195 Find The Number   4 127
14
11
6221 Increasing Powers of K   288
34
42
6256 Inversion Count   254 8744
15
17
12183 Help the Commander in Chief   17 326
14
17
3442 The last digit   76 15339
9
9
5971 LCM Sum   26 1280
19
31
9385 Strictly not a Prime   4 279
20
15
6450 PP numbers   3 708
17
17
3932 Point Connection Game in a Circle   1 605
17
26
12933 n-divisors   37 1407
19
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