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Prime Numbers in a Ten (Posted on 2006-11-06) Difficulty: 3 of 5
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?

See The Solution Submitted by Paddy    
Rating: 1.7500 (4 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(3): spoiler -- moreCharlie2006-11-18 16:36:09
Questionre(2): spoiler -- morePaddy2006-11-18 11:25:34
Solutionre: spoiler -- moreCharlie2006-11-06 09:13:22
spoilerRobby Goetschalckx2006-11-06 08:22:12
Grainsbrianjn2006-11-06 07:51:29
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