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| Dark Divisibility (Posted on 2013-04-27) |
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The natural numbers a,b,c,d are such that their least common multiple equals a+b+c+d. Prove that abcd is divisible by 3 or by 5.
re: Infinite examples, no proof yet.
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 | Comment 10 of 21 | 
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(In reply to Infinite examples, no proof yet. by Jer)
Is 42 not irreducible?:
1 + 6 + 14 + 21 = 42
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Posted by Charlie
on 2013-04-29 01:29:25 |
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