ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   5 71
17
34
32029 Ada and Connections   4 38
23
23
32840 Ada and Digits   12 82
21
19
32949 Ada and Digits 2   4 39
28
28
30739 Ada and Manure   12 181
9
22
30755 Ada and GCD   12 215
30
17
30691 Ada and Diary   34
1
1
30737 Ada and Homework   1 48
32683 Ada and Kohlrabi   3 37
28
6
32059 Ada and Taxes   11 52
23
23
5151 Alice’s Cube   7 468
26
23
10232 Distinct Primes   66 4551
9
9
4556 Think I will Buy Me a Football Team   24 1980
6
11
5451 Not So Flat After All   7 1067
11
8
13753 Amazing Prime Sequence   46 2763
11
12
30826 Bernoulli numbers   4 6
23
12
31066 Number Breaking   6 216
16
14
21357 Crucial Equation   60 3634
3
10
3505 Prime Number Theorem   16 1295
12
14
9032 Cube Free Numbers   49 3461
13
12
526 Divisors   31 1366
16
15
530 Divisors 2   8 740
15
17
22403 Divisors of factorial   58 1378
14
14
74 Divisor Summation   68 12962
7
10
23963 Easy Factorials   10 94
27
26
4141 Euler Totient Function   115 8163
8
12
22382 Euler Totient Function Depth   18 291
14
15
4942 Integer Factorization (15 digits)   29 2269
13
13
33046 Factorial Modulo Prime   2 11
42
34
25584 Factorial Modulo   23 342
10
15
25067 Fibonacci Polynomial   7 123
12
23
5970 Finding Primes   20 1061
16
14
6264 Rank of a Fraction   3 114
9
34
5978 Frequent Prime Ranges   6 598
13
11
3871 GCD Extreme   55 1228
19
26
26045 GCD OF MATRIX (hard)   2 13
50
17
12005 Grass Planting   6 205
37
17
18202 HUGE GCD   12 500
8
11
4164 A conjecture of Paul Erdős   8 751
10
9
12241 Classification from Erdős and Selfridge   3 21
26
26
27195 Find The Number   6 174
20
17
6221 Increasing Powers of K   4 324
24
34
6256 Inversion Count   415 11679
16
18
12183 Help the Commander in Chief   35 659
15
16
34812 Kth Power Summation   5 38
20
17
3442 The last digit   142 19131
9
9
5971 LCM Sum   55 1862
20
29
9385 Strictly not a Prime   8 332
17
12
6450 PP numbers   6 799
9
6
3932 Point Connection Game in a Circle   2 679
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