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 27
17
17
32949 Ada and Digits 2   2 19
26
26
30739 Ada and Manure   8 77
8
23
30755 Ada and GCD   5 68
26
13
30691 Ada and Diary   25
30737 Ada and Homework   6
32683 Ada and Kohlrabi   2 10
34
9
32059 Ada and Taxes   6 23
20
20
5151 Alice’s Cube   6 426
27
24
10232 Distinct Primes   40 3523
9
8
4556 Think I will Buy Me a Football Team   18 1758
7
13
5451 Not So Flat After All   7 1018
12
8
13753 Amazing Prime Sequence   31 2313
10
12
30826 Bernoulli numbers   2 3
17
17
31066 Number Breaking   2 90
12
12
21357 Crucial Equation   36 2423
3
11
3505 Prime Number Theorem   12 1125
12
15
9032 Cube Free Numbers   31 2855
13
11
526 Divisors   17 1090
17
15
530 Divisors 2   5 650
15
17
22403 Divisors of factorial   43 1005
15
15
74 Divisor Summation   48 11237
7
10
23963 Easy Factorials   8 65
26
26
4141 Euler Totient Function   68 6188
8
12
22382 Euler Totient Function Depth   13 194
12
12
4942 Integer Factorization (15 digits)   18 1784
11
10
33046 Factorial Modulo Prime   2 2
42
34
25584 Factorial Modulo   17 280
9
13
25067 Fibonacci Polynomial   4 61
23
23
5970 Finding Primes   13 860
17
15
6264 Rank of a Fraction   1 108
9
34
5978 Frequent Prime Ranges   4 550
9
6
3871 GCD Extreme   30 790
20
28
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 119
38
17
18202 HUGE GCD   5 380
5
13
4164 A conjecture of Paul Erdős   2 523
1
9
12241 Classification from Erdős and Selfridge   15
27195 Find The Number   4 132
14
11
6221 Increasing Powers of K   290
34
42
6256 Inversion Count   267 8951
15
17
12183 Help the Commander in Chief   19 347
14
17
3442 The last digit   80 15581
9
9
5971 LCM Sum   28 1330
19
30
9385 Strictly not a Prime   4 284
20
15
6450 PP numbers   3 714
17
17
3932 Point Connection Game in a Circle   1 606
17
26
12933 n-divisors   37 1445
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