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Find that decade (Posted on 2014-01-06) Difficulty: 2 of 5
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.

No Solution Yet Submitted by K Sengupta    
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Look Ma, no primes! | Comment 2 of 4 |

I'm sure you meant that 1891, 1893, 1895, 1897, 1899 were all composite.

  Posted by Steve Herman on 2014-01-06 14:09:02
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