ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   3 39
6
28
32029 Ada and Connections   3 29
17
17
32840 Ada and Digits   9 61
19
17
32949 Ada and Digits 2   4 30
28
28
30739 Ada and Manure   10 140
11
23
30755 Ada and GCD   7 141
26
15
30691 Ada and Diary   29
30737 Ada and Homework   1 40
32683 Ada and Kohlrabi   2 27
34
9
32059 Ada and Taxes   7 37
22
20
5151 Alice’s Cube   7 452
26
23
10232 Distinct Primes   54 4030
10
9
4556 Think I will Buy Me a Football Team   22 1897
6
11
5451 Not So Flat After All   7 1046
11
8
13753 Amazing Prime Sequence   36 2567
10
12
30826 Bernoulli numbers   3 5
23
12
31066 Number Breaking   4 165
11
11
21357 Crucial Equation   43 2921
4
11
3505 Prime Number Theorem   14 1207
12
14
9032 Cube Free Numbers   37 3148
12
11
526 Divisors   23 1226
16
13
530 Divisors 2   5 700
15
17
22403 Divisors of factorial   50 1203
15
14
74 Divisor Summation   58 12080
7
9
23963 Easy Factorials   11 80
27
27
4141 Euler Totient Function   92 7176
8
12
22382 Euler Totient Function Depth   16 243
14
14
4942 Integer Factorization (15 digits)   22 1999
13
12
33046 Factorial Modulo Prime   2 6
42
34
25584 Factorial Modulo   21 314
9
13
25067 Fibonacci Polynomial   6 101
17
21
5970 Finding Primes   17 964
16
16
6264 Rank of a Fraction   3 110
9
34
5978 Frequent Prime Ranges   4 576
13
10
3871 GCD Extreme   41 1020
19
26
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 149
38
17
18202 HUGE GCD   12 456
10
13
4164 A conjecture of Paul Erdős   4 601
8
11
12241 Classification from Erdős and Selfridge   3 19
26
26
27195 Find The Number   4 153
14
11
6221 Increasing Powers of K   3 309
26
34
6256 Inversion Count   343 10336
15
18
12183 Help the Commander in Chief   24 457
13
15
34812 Kth Power Summation   3 20
17
9
3442 The last digit   103 17227
9
9
5971 LCM Sum   42 1560
20
29
9385 Strictly not a Prime   7 308
20
15
6450 PP numbers   3 777
17
17
3932 Point Connection Game in a Circle   1 651
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