ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   4 63
13
30
32029 Ada and Connections   4 36
23
23
32840 Ada and Digits   11 77
20
17
32949 Ada and Digits 2   4 36
28
28
30739 Ada and Manure   11 171
10
24
30755 Ada and GCD   11 199
31
17
30691 Ada and Diary   33
1
1
30737 Ada and Homework   1 48
32683 Ada and Kohlrabi   3 37
28
6
32059 Ada and Taxes   10 49
21
21
5151 Alice’s Cube   7 468
26
23
10232 Distinct Primes   63 4479
9
9
4556 Think I will Buy Me a Football Team   24 1969
6
11
5451 Not So Flat After All   7 1063
11
8
13753 Amazing Prime Sequence   45 2736
11
12
30826 Bernoulli numbers   3 5
23
12
31066 Number Breaking   6 209
16
14
21357 Crucial Equation   57 3481
3
10
3505 Prime Number Theorem   15 1269
12
14
9032 Cube Free Numbers   48 3407
13
12
526 Divisors   30 1340
16
15
530 Divisors 2   8 726
15
17
22403 Divisors of factorial   56 1341
14
14
74 Divisor Summation   65 12799
7
10
23963 Easy Factorials   10 91
27
26
4141 Euler Totient Function   112 7949
8
12
22382 Euler Totient Function Depth   17 282
14
14
4942 Integer Factorization (15 digits)   29 2229
13
13
33046 Factorial Modulo Prime   2 11
42
34
25584 Factorial Modulo   23 333
10
14
25067 Fibonacci Polynomial   7 121
12
23
5970 Finding Primes   20 1020
16
14
6264 Rank of a Fraction   3 114
9
34
5978 Frequent Prime Ranges   5 592
13
10
3871 GCD Extreme   49 1178
19
26
26045 GCD OF MATRIX (hard)   2 10
50
17
12005 Grass Planting   6 201
37
17
18202 HUGE GCD   12 492
8
11
4164 A conjecture of Paul Erdős   7 723
9
10
12241 Classification from Erdős and Selfridge   3 20
26
26
27195 Find The Number   6 171
20
17
6221 Increasing Powers of K   4 322
24
34
6256 Inversion Count   406 11462
16
18
12183 Help the Commander in Chief   33 627
14
15
34812 Kth Power Summation   5 36
20
17
3442 The last digit   137 18764
9
9
5971 LCM Sum   52 1786
20
29
9385 Strictly not a Prime   8 329
17
13
6450 PP numbers   6 794
9
6
3932 Point Connection Game in a Circle   2 674
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