Sum of digits of 2^n equals n
Hans Havermann
pxp at rogers.com
Mon Jul 24 06:55:37 CEST 2006
Tanya Khovanova wrote:
> I found two numbers n such that sum of digits of 2^n is equal to n:
> 5 and 70.
> I can't find the corresponding sequence.
Because the sequence (likely) only has those two members.
Consider this related sequence: {1, 2, 4, 6, 8, 139, 309, 390, 819,
2868, 6751, 8045, 9414, 15008, 15375, 56839, ...}
Each n provides a value of (sum-of-digits of 5^n)/n that is closer to
pi than the previous value. I'm guessing there aren't many more
terms. ;)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.seqfan.eu/pipermail/seqfan/attachments/20060724/007a609e/attachment-0002.htm>
More information about the SeqFan
mailing list