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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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re: computer solution Comment 6 of 6 |
(In reply to computer solution by Charlie)

https://oeis.org/A175169
Numbers n such that n divides the sum of digits of 2^n.  1, 2, 5, 70

Not quite the same but any others in our set would be in this sequence.

And as I promised in my comment, I was surprised to see another example.

Edited on May 27, 2016, 4:42 pm
  Posted by Jer on 2016-05-27 16:42:04

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