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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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  Subject Author Date
re: Solution with proofarmando2018-03-30 09:00:46
SolutionSolution with proofPaul2018-03-29 12:23:53
Some Thoughtssolutions through k=1,000,000Charlie2018-03-29 10:11:46
A few easy onesJer2018-03-29 09:29:35
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