ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   4 49
13
30
32029 Ada and Connections   3 32
17
17
32840 Ada and Digits   10 69
20
17
32949 Ada and Digits 2   4 33
28
28
30739 Ada and Manure   10 150
11
23
30755 Ada and GCD   7 164
30
12
30691 Ada and Diary   29
30737 Ada and Homework   1 47
32683 Ada and Kohlrabi   2 31
34
9
32059 Ada and Taxes   8 41
22
20
5151 Alice’s Cube   7 459
26
23
10232 Distinct Primes   58 4208
10
9
4556 Think I will Buy Me a Football Team   23 1918
6
11
5451 Not So Flat After All   7 1052
11
8
13753 Amazing Prime Sequence   41 2627
10
12
30826 Bernoulli numbers   3 5
23
12
31066 Number Breaking   4 185
11
11
21357 Crucial Equation   51 3099
3
10
3505 Prime Number Theorem   14 1232
12
14
9032 Cube Free Numbers   41 3234
13
11
526 Divisors   25 1265
15
12
530 Divisors 2   5 709
15
17
22403 Divisors of factorial   53 1277
14
14
74 Divisor Summation   61 12367
7
9
23963 Easy Factorials   11 86
27
26
4141 Euler Totient Function   100 7445
8
12
22382 Euler Totient Function Depth   16 256
14
14
4942 Integer Factorization (15 digits)   24 2095
13
13
33046 Factorial Modulo Prime   2 7
42
34
25584 Factorial Modulo   22 326
9
13
25067 Fibonacci Polynomial   6 111
17
21
5970 Finding Primes   19 984
17
15
6264 Rank of a Fraction   3 111
9
34
5978 Frequent Prime Ranges   4 584
13
10
3871 GCD Extreme   45 1079
19
25
26045 GCD OF MATRIX (hard)   2 9
50
17
12005 Grass Planting   3 158
38
17
18202 HUGE GCD   11 477
9
12
4164 A conjecture of Paul Erdős   5 631
8
9
12241 Classification from Erdős and Selfridge   3 20
26
26
27195 Find The Number   4 159
14
11
6221 Increasing Powers of K   3 317
26
34
6256 Inversion Count   363 10745
16
18
12183 Help the Commander in Chief   28 514
14
15
34812 Kth Power Summation   4 26
21
14
3442 The last digit   116 17782
9
9
5971 LCM Sum   45 1628
19
29
9385 Strictly not a Prime   7 316
20
15
6450 PP numbers   3 781
17
17
3932 Point Connection Game in a Circle   1 662
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