ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   5 79
17
34
32029 Ada and Connections   4 45
23
23
32840 Ada and Digits   13 90
21
19
32949 Ada and Digits 2   4 41
28
28
30739 Ada and Manure   14 201
11
23
30755 Ada and GCD   13 247
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   12 60
24
24
5151 Alice’s Cube   7 471
26
23
10232 Distinct Primes   71 4782
9
9
4556 Think I will Buy Me a Football Team   27 2022
7
11
5451 Not So Flat After All   7 1074
11
8
13753 Amazing Prime Sequence   50 2870
10
12
30826 Bernoulli numbers   4 6
23
12
31066 Number Breaking   7 249
16
14
21357 Crucial Equation   67 4106
3
9
3505 Prime Number Theorem   17 1339
12
14
9032 Cube Free Numbers   53 3597
12
11
526 Divisors   32 1441
16
15
530 Divisors 2   8 754
15
17
22403 Divisors of factorial   60 1435
14
14
74 Divisor Summation   73 13483
7
10
23963 Easy Factorials   10 97
27
26
4141 Euler Totient Function   120 8660
8
11
22382 Euler Totient Function Depth   19 304
14
15
4942 Integer Factorization (15 digits)   35 2450
12
12
33046 Factorial Modulo Prime   2 11
42
34
25584 Factorial Modulo   23 352
10
15
25067 Fibonacci Polynomial   8 133
10
20
5970 Finding Primes   20 1122
16
14
6264 Rank of a Fraction   3 119
9
34
5978 Frequent Prime Ranges   6 610
13
11
3871 GCD Extreme   61 1348
19
27
26045 GCD OF MATRIX (hard)   2 22
50
17
12005 Grass Planting   6 219
37
17
18202 HUGE GCD   14 515
11
12
4164 A conjecture of Paul Erdős   9 914
12
11
12241 Classification from Erdős and Selfridge   3 21
26
26
27195 Find The Number   7 184
20
17
6221 Increasing Powers of K   4 326
24
34
6256 Inversion Count   452 12286
16
18
12183 Help the Commander in Chief   41 763
14
16
34812 Kth Power Summation   4 41
20
17
3442 The last digit   159 20298
9
8
5971 LCM Sum   59 2055
19
28
9385 Strictly not a Prime   8 334
17
12
6450 PP numbers   8 825
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