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ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   6 128
17
34
32029 Ada and Connections   6 69
24
24
32840 Ada and Digits   15 168
20
18
32949 Ada and Digits 2   5 71
30
30
30739 Ada and Manure   17 298
11
22
30755 Ada and GCD   20 434
28
15
30691 Ada and Diary   2 56
9
9
30737 Ada and Homework   3 63
34
34
32683 Ada and Kohlrabi   5 67
30
13
32059 Ada and Taxes   15 102
23
22
5151 Alice’s Cube   8 501
24
21
10232 Distinct Primes   83 5786
10
9
4556 Think I will Buy Me a Football Team   30 2167
7
11
5451 Not So Flat After All   9 1116
11
10
13753 Amazing Prime Sequence   61 3303
11
12
30826 Bernoulli numbers   4 7
23
12
31066 Number Breaking   10 748
13
12
21357 Crucial Equation   79 6010
4
9
3505 Prime Number Theorem   25 1521
14
13
9032 Cube Free Numbers   65 4117
12
11
526 Divisors   37 1682
14
13
530 Divisors 2   10 905
12
16
22403 Divisors of factorial   71 1910
14
14
74 Divisor Summation   92 15853
8
10
23963 Easy Factorials   10 112
27
26
4141 Euler Totient Function   144 11440
8
11
22382 Euler Totient Function Depth   24 374
15
16
4942 Integer Factorization (15 digits)   45 3372
11
11
33046 Factorial Modulo Prime   3 28
45
39
25584 Factorial Modulo   25 408
10
15
25067 Fibonacci Polynomial   8 214
10
20
5970 Finding Primes   22 1327
16
15
6264 Rank of a Fraction   4 129
12
34
5978 Frequent Prime Ranges   9 689
13
13
3871 GCD Extreme   78 2523
18
26
41657 GCD Goodness   2 22
17
26
26045 GCD OF MATRIX (hard)   3 119
47
28
41507 GCD Product Sum   5 40
8
24
12005 Grass Planting   9 498
32
17
18202 HUGE GCD   17 667
14
13
4164 A conjecture of Paul Erdős   23 2048
16
14
12241 Classification from Erdős and Selfridge   5 27
28
28
27195 Find The Number   7 207
20
17
6221 Increasing Powers of K   4 351
24
34
6256 Inversion Count   529 16786
16
18
40083 Just Primes   11 106
15
17
40084 Just Primes II   7 21
34
30
12183 Help the Commander in Chief   46 906
15
16
34812 Kth Power Summation   6 54
25
19
3442 The last digit   188 29288
9
8

#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


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