A274559 Numbers k such that sigma(k) == 0 (mod k+7).

8, 272, 7232, 30848, 516608, 134094848, 2146992128, 35184309174272

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

sigma(8) mod (8+7) = 15 mod 15 = 0.

Mathematica

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

Crossrefs

Contains subsequence A141546.

Cf. A045770, A067702, A088833, A181598, A274551, A274552, A274553, A274554, A274556, A274557, A274558, A274560, A274561, A274562, A274563, A274564, A274565, A274566.

Sequence in context: A300047 A336214 A129424 * A338636 A335586 A159496

Adjacent sequences: A274556 A274557 A274558 * A274560 A274561 A274562

Keyword

nonn,more

Author

Paolo P. Lava, Jul 05 2016

Extensions

a(6)-a(7) from Giovanni Resta, Jul 05 2016

a(8) from Max Alekseyev, May 29 2025

Status

approved