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ID NAME QUALITY USERS ACC % DIFFICULTY C I
30757 Ada and Carrot   6 134
17
34
32029 Ada and Connections   7 71
26
28
32840 Ada and Digits   15 174
20
18
32949 Ada and Digits 2   5 74
30
30
30739 Ada and Manure   18 312
11
22
30755 Ada and GCD   20 444
28
15
30691 Ada and Diary   3 58
9
9
30737 Ada and Homework   5 68
34
28
32683 Ada and Kohlrabi   5 70
30
13
32059 Ada and Taxes   16 106
23
23
5151 Alice’s Cube   8 509
24
21
10232 Distinct Primes   85 5901
10
9
4556 Think I will Buy Me a Football Team   30 2184
7
11
5451 Not So Flat After All   9 1125
11
10
13753 Amazing Prime Sequence   61 3350
11
12
30826 Bernoulli numbers   4 7
23
12
31066 Number Breaking   10 847
13
12
21357 Crucial Equation   80 6332
4
9
3505 Prime Number Theorem   25 1534
14
13
9032 Cube Free Numbers   65 4157
12
11
526 Divisors   38 1705
14
13
530 Divisors 2   10 931
12
16
22403 Divisors of factorial   71 1968
14
14
74 Divisor Summation   95 16547
7
10
23963 Easy Factorials   10 113
27
26
4141 Euler Totient Function   147 11882
8
11
22382 Euler Totient Function Depth   24 390
15
16
4942 Integer Factorization (15 digits)   45 3593
11
11
33046 Factorial Modulo Prime   4 31
46
42
25584 Factorial Modulo   25 413
10
15
25067 Fibonacci Polynomial   8 237
11
19
5970 Finding Primes   22 1341
16
15
6264 Rank of a Fraction   4 131
12
34
5978 Frequent Prime Ranges   10 710
14
14
3871 GCD Extreme   81 2950
19
26
41657 GCD Goodness   2 24
17
26
26045 GCD OF MATRIX (hard)   4 134
42
29
41507 GCD Product Sum   6 47
6
23
12005 Grass Planting   11 573
29
19
18202 HUGE GCD   17 684
14
13
4164 A conjecture of Paul Erdős   24 2534
16
15
12241 Classification from Erdős and Selfridge   5 29
28
28
27195 Find The Number   7 215
20
17
6221 Increasing Powers of K   4 356
24
34
6256 Inversion Count   533 17745
16
18
40083 Just Primes   11 114
15
17
40084 Just Primes II   7 25
34
30
12183 Help the Commander in Chief   46 914
15
16
34812 Kth Power Summation   6 54
25
19
3442 The last digit   190 29895
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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