OJ Board

Thanks... I was using strings

0/15 = 0.0(0)
0 = number of digits in repeating cycle.

It's it right!? I've got an beautiful "runtime error"

You can't run such a loop. It will take more than a minute (probably).

Generate all the numbers whose prime factors are 2, 3, 5, 7 and insert them in a sorted list like we do in insertion sort. For example, 1 is a humble number. Now multiply it with 2, 3, 5 and 7 and the new list will be 1 2 3 5 7 ...

But, if you use an simple matricce multiplication, what happens!?