A274560 Numbers k such that sigma(k) == 0 (mod k-7).

3, 5, 6, 8, 10, 11, 15, 27, 34, 72, 232, 34432, 549762629632, 37778931864743868104704

Offset

1,1

Links

Table of n, a(n) for n=1..14.

Example

sigma(8) mod (8-7) = 15 mod 1 = 0.

Mathematica

Select[Range[1, 10^6], Mod[DivisorSigma[1, #], # - 7] == 0 &] (* Michael De Vlieger, Jul 05 2016 *)

Crossrefs

Contains subsequence A141550.

Cf. A000203, A045770, A067702, A088833, A181598, A274551, A274552, A274553, A274554, A274556, A274557, A274558, A274559, A274561, A274562, A274563, A274564, A274565, A274566

Sequence in context: A283965 A193599 A068125 * A139437 A233746 A299233

Adjacent sequences: A274557 A274558 A274559 * A274561 A274562 A274563

Keyword

nonn,more

Author

Paolo P. Lava, Jul 05 2016

Extensions

a(13) from Giovanni Resta

Terms 3,5,6 inserted by Max Alekseyev, May 29 2025

a(14) from Max Alekseyev, Jan 30 2026

Status

approved