ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   3 32
6
28
32029 Ada and Connections   2 24
17
17
32840 Ada and Digits   8 48
19
17
32949 Ada and Digits 2   3 26
28
28
30739 Ada and Manure   9 115
10
23
30755 Ada and GCD   6 117
24
14
30691 Ada and Diary   28
30737 Ada and Homework   1 38
32683 Ada and Kohlrabi   2 23
34
9
32059 Ada and Taxes   7 31
22
20
5151 Alice’s Cube   7 446
26
23
10232 Distinct Primes   50 3876
10
9
4556 Think I will Buy Me a Football Team   20 1864
7
12
5451 Not So Flat After All   7 1037
12
8
13753 Amazing Prime Sequence   35 2471
10
12
30826 Bernoulli numbers   2 4
17
17
31066 Number Breaking   4 147
11
11
21357 Crucial Equation   41 2719
3
10
3505 Prime Number Theorem   14 1183
12
14
9032 Cube Free Numbers   34 3072
13
12
526 Divisors   22 1170
16
13
530 Divisors 2   5 689
15
17
22403 Divisors of factorial   47 1128
15
14
74 Divisor Summation   55 11762
7
10
23963 Easy Factorials   10 74
28
28
4141 Euler Totient Function   84 6875
8
12
22382 Euler Totient Function Depth   16 232
14
14
4942 Integer Factorization (15 digits)   22 1932
13
12
33046 Factorial Modulo Prime   2 3
42
34
25584 Factorial Modulo   20 303
9
13
25067 Fibonacci Polynomial   5 96
23
23
5970 Finding Primes   15 922
18
16
6264 Rank of a Fraction   3 110
9
34
5978 Frequent Prime Ranges   4 571
13
10
3871 GCD Extreme   37 944
20
26
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 132
38
17
18202 HUGE GCD   8 433
8
14
4164 A conjecture of Paul Erdős   3 558
9
13
12241 Classification from Erdős and Selfridge   3 19
26
26
27195 Find The Number   4 145
14
11
6221 Increasing Powers of K   3 306
26
34
6256 Inversion Count   316 9921
15
18
12183 Help the Commander in Chief   22 418
14
15
34812 Kth Power Summation   3 14
17
9
3442 The last digit   92 16638
9
9
5971 LCM Sum   38 1481
20
30
9385 Strictly not a Prime   6 304
20
15
6450 PP numbers   3 761
17
17
3932 Point Connection Game in a Circle   1 635
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