[seqfan] Re: Is A014664 a permutation?

Neil Sloane njasloane at gmail.com
Sun Feb 21 19:20:05 CET 2016


6 seems to be missing from A014664, and 11 appears twice, so probably not a
perm.

Best regards
Neil

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com


On Sun, Feb 21, 2016 at 12:51 PM, Felix Fröhlich <felix.froe at gmail.com>
wrote:

> Dear SeqFans,
>
> is A014664 the same as smallest k > 1 not already in the sequence such that
> p = prime(n) is a factor of 2^k-1? If the answer is yes, is the sequence a
> permutation of the positive integers > 1?
>
> I added this as a comment to the sequence, but maybe if someone knows the
> answer to this question, it could be added as a definitive statement
> instead.
>
> Best regards
> Felix Fröhlich
>
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