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Equal digit sum (Posted on 2012-11-22) Difficulty: 5 of 5
Find all integers n such that S(n) = S(2n) = ... = S(n*n), where S is the sum of the base-10 digits.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
Solutionre: The first answer (spoiler)Ady TZIDON2012-11-22 16:26:53
Some Thoughtsre: computer exploration--no proofCharlie2012-11-22 12:14:06
Some Thoughtscomputer exploration--no proofCharlie2012-11-22 12:08:45
Some ThoughtsThe first answer (spoiler)Steve Herman2012-11-22 12:01:25
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