[seqfan] Re: A122036

Charles Greathouse charles.greathouse at case.edu
Mon Mar 21 21:48:34 CET 2011


A136446 contains infinitely many odds, as noted in the sequence.  The
first is a(220) = 945.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

On Mon, Mar 21, 2011 at 9:21 AM, Matevž Markovič
<matevz.markovic.v at gmail.com> wrote:
> If I understand this correctly, numbers in A122036 are:
> - odd
> - abundant (sum of all its proper divisors is bigger than 2*n)
> - sum of any subset of their divisors (divisors D - {1,n}) never equals n
> (A136446)
>
> But in A136446 there are only even numbers. It is conjectured that an odd
> number in A136446 exists, is that the reason for this limitation?
>
> Thank you for your clarification!
>
>                       Matevž Markovič
>
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