Possibly interesting sequence

David Wilson dwilson at gambitcomm.com
Mon Aug 11 16:01:39 CEST 2008

I found a puzzle site that poses in effect the following problem:

For a set S of positive integers, call n = SUM(k in S, k) good when 
SUM(k in S, 1/k) = 1. Which integers are good?

Fun for you programmers.

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