ID NAME QUALITY USERS ACC % DIFFICULTY C I
19975 Amazing Prime Sequence (hard)   5 90
39
45
20174 Counting Divisors (cube)   7 385
21
42
34096 Counting Divisors (general)   6 353
38
45
22549 Divisors of factorial (extreme)   5 88
34
36
36936 K-Divisors   3 13
39
39
25024 Nth Prime   7 106
34
39

#fast-prime-counting