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Choose To Prime Poser (Posted on 2010-04-18) Difficulty: 3 of 5
Determine all possible values of a positive integer N ≥ 3, such that NC2 – 1 is a prime power.

Note: NC2 represents N choose 2.

See The Solution Submitted by K Sengupta    
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re: No Subject | Comment 3 of 4 |
(In reply to No Subject by Jer)

"(B) Both factors are powers of 3."

Why must that be true?

  Posted by farcear on 2010-04-24 22:10:51

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