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An exponent and prime problem (Posted on 2007-01-06) Difficulty: 2 of 5
Given that n is a positive prime number. Determine analytically all possible n such that 2n + n2 is a prime number.

See The Solution Submitted by K Sengupta    
Rating: 4.0000 (2 votes)

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re: needs a second attempt (correction) | Comment 2 of 6 |
(In reply to needs a second attempt by elementofsurprize)

correction: n should be such odd number that its square ends in either 9 or 5.
  Posted by elementofsurprize on 2007-01-06 14:51:48

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