ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   5 84
17
34
32029 Ada and Connections   4 47
23
23
32840 Ada and Digits   14 99
21
18
32949 Ada and Digits 2   4 44
28
28
30739 Ada and Manure   15 215
11
22
30755 Ada and GCD   14 265
29
16
30691 Ada and Diary   1 37
1
1
30737 Ada and Homework   1 49
32683 Ada and Kohlrabi   5 42
30
13
32059 Ada and Taxes   13 65
23
23
5151 Alice’s Cube   7 474
26
23
10232 Distinct Primes   73 4897
10
8
4556 Think I will Buy Me a Football Team   28 2036
7
11
5451 Not So Flat After All   8 1076
11
10
13753 Amazing Prime Sequence   50 2921
10
12
30826 Bernoulli numbers   4 6
23
12
31066 Number Breaking   7 267
16
14
21357 Crucial Equation   68 4316
3
9
3505 Prime Number Theorem   17 1352
12
14
9032 Cube Free Numbers   55 3658
12
11
526 Divisors   33 1457
15
14
530 Divisors 2   8 756
15
17
22403 Divisors of factorial   59 1467
14
14
74 Divisor Summation   74 13669
7
10
23963 Easy Factorials   10 101
27
26
4141 Euler Totient Function   123 8934
8
11
22382 Euler Totient Function Depth   19 310
14
15
4942 Integer Factorization (15 digits)   35 2556
12
12
33046 Factorial Modulo Prime   2 11
42
34
25584 Factorial Modulo   23 355
10
15
25067 Fibonacci Polynomial   8 133
10
20
5970 Finding Primes   20 1136
16
14
6264 Rank of a Fraction   4 124
12
34
5978 Frequent Prime Ranges   6 616
13
11
3871 GCD Extreme   63 1417
19
26
26045 GCD OF MATRIX (hard)   2 25
50
17
12005 Grass Planting   6 226
37
17
18202 HUGE GCD   14 519
11
12
4164 A conjecture of Paul Erdős   11 994
12
10
12241 Classification from Erdős and Selfridge   3 21
26
26
27195 Find The Number   7 188
20
17
6221 Increasing Powers of K   4 326
24
34
6256 Inversion Count   475 12565
16
18
12183 Help the Commander in Chief   44 795
14
16
34812 Kth Power Summation   4 42
20
17
3442 The last digit   168 20808
9
8
5971 LCM Sum   63 2177
19
28
9385 Strictly not a Prime   8 336
17
12
6450 PP numbers   8 829
11
4
3932 Point Connection Game in a Circle   2 686
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