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| Comb(k,2) (Posted on 2018-03-29) |
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For which k ≥ 3 is k(k-1)/2 (i.e. k choose 2) one more than a power of a prime number?
re: Solution with proof
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Comment 4 of 4 | 
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(In reply to Solution with proof by Paul)
Nicely done
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Posted by armando
on 2018-03-30 09:00:46 |
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