ID NAME QUALITY USERS ACC % DIFFICULTY C I
19975 Amazing Prime Sequence (hard)   5 86
39
45
20174 Counting Divisors (cube)   6 361
17
41
34096 Counting Divisors (general)   4 326
40
43
22549 Divisors of factorial (extreme)   5 78
34
34
36936 K-Divisors   3 10
39
39
25024 Nth Prime   6 93
34
39

#fast-prime-counting