A294406 - OEIS

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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).

2

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

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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