%I #32 Sep 08 2021 21:17:26
%S 9,13,15,21,23,27,29,33,35,43,45
%N Positive odd numbers k such that both (sigma(m) - 2*m) and (2*m - sigma(m)) are never equal to k, where sigma(.) is the sum of divisors function A000203 (conjectured).
%Y Intersection of A234285 and A234286.
%Y Inspired by _Michel Marcus_'s comment in A294347.
%Y Cf. A000203, A033879, A033880, A005100, A005101.
%K nonn,more,hard
%O 1,1
%A _Omar E. Pol_, Oct 30 2017