All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers
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)

Comments: ( Back to comment list | You must be logged in to post comments.)
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 ... would be surprising to see another solution.

 surprise us , Charlie!

  Posted by Ady TZIDON on 2016-05-27 11:48:34
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2020 by Animus Pactum Consulting. All rights reserved. Privacy Information