ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   5 98
17
34
32029 Ada and Connections   4 52
23
23
32840 Ada and Digits   14 133
21
18
32949 Ada and Digits 2   4 55
28
28
30739 Ada and Manure   17 234
11
22
30755 Ada and GCD   15 307
29
16
30691 Ada and Diary   1 44
1
1
30737 Ada and Homework   1 50
32683 Ada and Kohlrabi   5 46
30
13
32059 Ada and Taxes   15 76
22
22
5151 Alice’s Cube   7 481
26
23
10232 Distinct Primes   79 5192
9
8
4556 Think I will Buy Me a Football Team   28 2061
7
11
5451 Not So Flat After All   9 1086
11
10
13753 Amazing Prime Sequence   59 3059
11
12
30826 Bernoulli numbers   4 6
23
12
31066 Number Breaking   7 371
16
14
21357 Crucial Equation   74 4911
4
9
3505 Prime Number Theorem   17 1406
13
14
9032 Cube Free Numbers   60 3832
12
11
526 Divisors   34 1502
16
14
530 Divisors 2   8 773
15
17
22403 Divisors of factorial   63 1554
14
14
74 Divisor Summation   78 14248
7
10
23963 Easy Factorials   10 105
27
26
4141 Euler Totient Function   130 9547
8
11
22382 Euler Totient Function Depth   20 321
13
14
4942 Integer Factorization (15 digits)   42 2730
11
11
33046 Factorial Modulo Prime   3 13
45
39
25584 Factorial Modulo   23 361
10
15
25067 Fibonacci Polynomial   8 134
10
20
5970 Finding Primes   21 1218
17
15
6264 Rank of a Fraction   4 124
12
34
5978 Frequent Prime Ranges   7 627
14
12
3871 GCD Extreme   65 1586
19
26
26045 GCD OF MATRIX (hard)   2 24
50
17
12005 Grass Planting   6 240
37
17
18202 HUGE GCD   14 533
11
12
4164 A conjecture of Paul Erdős   17 1217
12
12
12241 Classification from Erdős and Selfridge   3 21
26
26
27195 Find The Number   7 192
20
17
6221 Increasing Powers of K   4 331
24
34
6256 Inversion Count   495 13402
16
18
40083 Just Primes   7 37
14
17
40084 Just Primes II   3 7
34
26
12183 Help the Commander in Chief   45 842
15
16
34812 Kth Power Summation   4 39
20
17
3442 The last digit   174 22604
9
8
5971 LCM Sum   68 2402
19
28
9385 Strictly not a Prime   8 344
17
12

#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