A294406 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).

9, 13, 15, 21, 23, 27, 29, 33, 35, 43, 45

Offset

1,1

Links

Table of n, a(n) for n=1..11.

Crossrefs

Intersection of A234285 and A234286.

Inspired by Michel Marcus's comment in A294347.

Cf. A000203, A033879, A033880, A005100, A005101.

Sequence in context: A135439 A176188 A205851 * A049733 A065977 A294999

Adjacent sequences: A294403 A294404 A294405 * A294407 A294408 A294409

Keyword

nonn,more,hard

Author

Omar E. Pol, Oct 30 2017

Status

approved