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| Lucky Numbers (Posted on 2005-02-19) |
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Call an integer lucky if it is a sum of positive integers (not necessarily distinct) whose reciprocals sum to 1. For example, 4 and 11 are lucky: 4=2+2 and 1/2+1/2=1, and 11=2+3+6 and 1/2+1/3+1/6=1. But 2, 3, and 5 are unlucky. How many unlucky positive integers are there?
solution
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 | Comment 3 of 7 | 
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infinity
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Posted by parvez
on 2005-02-21 13:31:12 |
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