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Power of 2 (Posted on 2016-05-27) Difficulty: 4 of 5
Find integers N for which the sum of the digits in 2N equals N.

No Solution Yet Submitted by Ady TZIDON    
Rating: 5.0000 (1 votes)

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Hints/Tips re: What I can find @ Charlie | Comment 2 of 6 |
(In reply to What I can find by Jer)

....

In fact only if N is of the form 18a+5 will the digital roots of N and 2^5 be the same (5).  why???
 only N=5 works.  not quite

It's possible, but unlikely ...    ...it would be surprising to see another solution.

 surprise us , Charlie!

  Posted by Ady TZIDON on 2016-05-27 11:48:34
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