ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   3 35
6
28
32029 Ada and Connections   2 27
17
17
32840 Ada and Digits   9 57
19
17
32949 Ada and Digits 2   3 27
28
28
30739 Ada and Manure   9 127
10
23
30755 Ada and GCD   7 139
26
15
30691 Ada and Diary   28
30737 Ada and Homework   1 39
32683 Ada and Kohlrabi   2 23
34
9
32059 Ada and Taxes   7 35
22
20
5151 Alice’s Cube   7 450
26
23
10232 Distinct Primes   52 3956
10
9
4556 Think I will Buy Me a Football Team   20 1877
7
12
5451 Not So Flat After All   7 1041
11
8
13753 Amazing Prime Sequence   35 2526
10
12
30826 Bernoulli numbers   3 5
23
12
31066 Number Breaking   4 157
11
11
21357 Crucial Equation   42 2828
3
11
3505 Prime Number Theorem   14 1200
12
14
9032 Cube Free Numbers   36 3120
12
11
526 Divisors   22 1199
16
13
530 Divisors 2   5 697
15
17
22403 Divisors of factorial   49 1168
15
14
74 Divisor Summation   55 11915
7
9
23963 Easy Factorials   11 78
27
27
4141 Euler Totient Function   87 7057
8
12
22382 Euler Totient Function Depth   16 242
14
14
4942 Integer Factorization (15 digits)   22 1985
13
12
33046 Factorial Modulo Prime   2 3
42
34
25584 Factorial Modulo   20 310
9
13
25067 Fibonacci Polynomial   6 98
17
21
5970 Finding Primes   16 954
17
15
6264 Rank of a Fraction   3 110
9
34
5978 Frequent Prime Ranges   4 576
13
10
3871 GCD Extreme   39 991
20
26
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 132
38
17
18202 HUGE GCD   11 447
9
15
4164 A conjecture of Paul Erdős   3 578
9
13
12241 Classification from Erdős and Selfridge   3 19
26
26
27195 Find The Number   4 149
14
11
6221 Increasing Powers of K   3 308
26
34
6256 Inversion Count   328 10127
15
18
12183 Help the Commander in Chief   23 434
13
15
34812 Kth Power Summation   3 18
17
9
3442 The last digit   96 16954
9
9
5971 LCM Sum   40 1534
19
29
9385 Strictly not a Prime   7 307
20
15
6450 PP numbers   3 769
17
17
3932 Point Connection Game in a Circle   1 645
12
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