ID NAME QUALITY USERS ACC % DIFFICULTY C I
19975 Amazing Prime Sequence (hard)   5 89
39
45
20174 Counting Divisors (cube)   7 385
21
42
34096 Counting Divisors (general)   5 351
42
45
22549 Divisors of factorial (extreme)   5 87
34
36
36936 K-Divisors   3 13
39
39
25024 Nth Prime   7 104
34
39

#fast-prime-counting