ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   4 45
13
30
32029 Ada and Connections   3 31
17
17
32840 Ada and Digits   10 65
20
17
32949 Ada and Digits 2   4 31
28
28
30739 Ada and Manure   10 145
11
23
30755 Ada and GCD   6 153
30
12
30691 Ada and Diary   29
30737 Ada and Homework   1 44
32683 Ada and Kohlrabi   2 30
34
9
32059 Ada and Taxes   7 37
22
20
5151 Alice’s Cube   7 458
26
23
10232 Distinct Primes   56 4155
10
9
4556 Think I will Buy Me a Football Team   23 1903
6
11
5451 Not So Flat After All   7 1048
11
8
13753 Amazing Prime Sequence   38 2599
10
12
30826 Bernoulli numbers   3 5
23
12
31066 Number Breaking   4 174
11
11
21357 Crucial Equation   47 2999
3
10
3505 Prime Number Theorem   14 1218
12
14
9032 Cube Free Numbers   41 3203
12
11
526 Divisors   25 1247
15
12
530 Divisors 2   5 704
15
17
22403 Divisors of factorial   52 1263
14
14
74 Divisor Summation   60 12217
7
9
23963 Easy Factorials   11 84
27
26
4141 Euler Totient Function   97 7325
8
12
22382 Euler Totient Function Depth   16 246
14
14
4942 Integer Factorization (15 digits)   23 2044
13
12
33046 Factorial Modulo Prime   2 7
42
34
25584 Factorial Modulo   22 317
9
13
25067 Fibonacci Polynomial   6 104
17
21
5970 Finding Primes   18 972
17
16
6264 Rank of a Fraction   3 111
9
34
5978 Frequent Prime Ranges   4 580
13
10
3871 GCD Extreme   42 1052
19
26
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 154
38
17
18202 HUGE GCD   12 467
10
13
4164 A conjecture of Paul Erdős   4 613
8
11
12241 Classification from Erdős and Selfridge   3 20
26
26
27195 Find The Number   4 156
14
11
6221 Increasing Powers of K   3 313
26
34
6256 Inversion Count   355 10553
16
18
12183 Help the Commander in Chief   26 481
13
15
34812 Kth Power Summation   4 22
21
14
3442 The last digit   104 17527
9
9
5971 LCM Sum   43 1596
20
29
9385 Strictly not a Prime   7 310
20
15
6450 PP numbers   3 778
17
17
3932 Point Connection Game in a Circle   1 657
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