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Comb(k,2) (Posted on 2018-03-29) Difficulty: 3 of 5
For which k ≥ 3 is k(k-1)/2 (i.e. k choose 2) one more than a power of a prime number?

No Solution Yet Submitted by Ady TZIDON    
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re: Solution with proof Comment 4 of 4 |
(In reply to Solution with proof by Paul)

Nicely done
  Posted by armando on 2018-03-30 09:00:46

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