There has been only a single instance in the course of American history (1776 AD onwards) wherein there was a decade in which four of the years were prime numbers. Find that decade.

(In reply to re: Look Ma, no primes! by Ady TZIDON)

Ady:  Thanks for the added curios.  The edit that I think you still want to make is to change the 2nd 1891 to 1899.

Posted by Steve Herman on 2014-01-06 19:39:23