ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   3 26
6
28
32029 Ada and Connections   2 20
17
17
32840 Ada and Digits   7 36
17
17
32949 Ada and Digits 2   3 24
28
28
30739 Ada and Manure   9 101
8
24
30755 Ada and GCD   6 96
24
14
30691 Ada and Diary   25
30737 Ada and Homework   1 37
32683 Ada and Kohlrabi   2 22
34
9
32059 Ada and Taxes   6 26
20
20
5151 Alice’s Cube   6 437
27
24
10232 Distinct Primes   47 3726
10
9
4556 Think I will Buy Me a Football Team   20 1836
7
12
5451 Not So Flat After All   7 1032
12
8
13753 Amazing Prime Sequence   34 2418
9
12
30826 Bernoulli numbers   2 3
17
17
31066 Number Breaking   3 125
11
11
21357 Crucial Equation   37 2617
3
11
3505 Prime Number Theorem   14 1167
11
14
9032 Cube Free Numbers   33 2992
13
12
526 Divisors   20 1142
17
13
530 Divisors 2   5 677
15
17
22403 Divisors of factorial   47 1081
15
14
74 Divisor Summation   53 11571
7
10
23963 Easy Factorials   10 69
28
28
4141 Euler Totient Function   79 6581
8
12
22382 Euler Totient Function Depth   16 227
14
14
4942 Integer Factorization (15 digits)   21 1901
13
13
33046 Factorial Modulo Prime   2 3
42
34
25584 Factorial Modulo   18 290
9
13
25067 Fibonacci Polynomial   5 90
23
23
5970 Finding Primes   15 899
18
16
6264 Rank of a Fraction   3 108
9
34
5978 Frequent Prime Ranges   4 564
13
10
3871 GCD Extreme   37 886
20
26
26045 GCD OF MATRIX (hard)   1 6
12005 Grass Planting   3 125
38
17
18202 HUGE GCD   8 410
8
14
4164 A conjecture of Paul Erdős   3 549
9
13
12241 Classification from Erdős and Selfridge   3 18
26
26
27195 Find The Number   4 141
14
11
6221 Increasing Powers of K   2 302
26
34
6256 Inversion Count   293 9581
15
18
12183 Help the Commander in Chief   20 390
14
17
3442 The last digit   90 16203
9
9
5971 LCM Sum   35 1431
21
30
9385 Strictly not a Prime   6 294
20
15
6450 PP numbers   3 740
17
17
3932 Point Connection Game in a Circle   1 627
17
26
34567 Least prime divisor   1 9

#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