[seqfan] Comment in A095810
David Corneth
davidacorneth at gmail.com
Mon Oct 30 17:39:55 CET 2017
Hi all,
There is a comment written in 2004 by Francisco Salinas in A095810
<https://oeis.org/A095810> that might need some more editing I think.
It's
"If we have only the last k digits of a large integer N, you find that N is
not a power of 2 if and only if the number given by those digits is
divisible by 5 OR not a multiple of 2^k OR a value > 2^k*(5^k-1)."
I think it would mean that 6 is a power of 2; it's a multiple of 2 and not
divisible by 5 (The last test doesn't change the verdict as 10^k has k+1
digits. 10^k - 2^k < N < 10^k isn't divisible by 2^k hence is excluded by
the first test.).
So, what to do with the comment?
Best,
David
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
Virusvrij.
www.avast.com
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
More information about the SeqFan
mailing list