https://oeis.org/A175169Numbers n such that n divides the sum of digits of 2^n. 1, 2, 5, 70Not 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
blackjack
<a href="http://c.casalemedia.com/c?s=51816&f=3&id=0" target="_blank"><img src="http://as.casalemedia.com/s?s=51816&u=http://perplexus.info&f=3&id=0&if=0" width="120" height="600" border="0"></a>
flooble's webmaster puzzle
re: computer solution
