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

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

Offset: 1

Author

Paolo P. Lava, Jul 05 2016

Keywords

• nonn
• more

Examples

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

Crossrefs

Contains subsequence A141550.

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

Programs

Mathematica

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

Extensions

a(13) from Giovanni Resta

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