## Problem of the Day #341: A Matter of Divisibility
*February 23, 2012*

*Posted by Saketh in : potd , trackback*

Kevin Au, a famous number theorist, is counting positive integers less than or equal to $10000$. However, he ignores all numbers divisible by more than one single-digit prime. How many such numbers will he count?

## Comments»

no comments yet - be the first?