In the first decade of numbers (1-10), there are four prime numbers (2,3,5,7). In the second decade (11-20), there are another four (11,13,17,19).

Are there other such decades with four prime numbers?

In my white robe I walk this beach of sand. How many of these minute particles must I pass through my sieve?

Posted by brianjn on 2006-11-06 07:51:29