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Favorable Numbers (Posted on 2006-11-02) Difficulty: 2 of 5
Call a positive integer n "favorable" if there is a set of n distinct positive integers whose reciprocals' sum adds to 1.

How many unfavorable numbers are there?

See The Solution Submitted by Gamer    
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  Subject Author Date
SolutionMe too, me too! But...JLo2006-11-02 13:42:05
SolutionInductive answerFederico Kereki2006-11-02 12:43:16
SolutionEric2006-11-02 12:14:47
SolutionMinimalist Answer / No SpoilerOld Original Oskar!2006-11-02 10:56:09
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