A274563 Numbers k such that sigma(k) == 0 (mod k+9).

15, 208, 6976, 8415, 31815, 351351, 2077696, 20487159, 159030135, 536559616, 2586415095, 137433972736, 2199003332608

Offset: 1

Author

Paolo P. Lava, Jul 06 2016

Keywords

• nonn
• more

Examples

			sigma(15) mod (15 + 9) = 24 mod 24 = 0.
		

Crossrefs

Cf. A045770, A067702, A088833, A181598, A223610, A274551-A274562, A274564-A274566.

Programs

Mathematica

Select[Range[10^6], Mod[DivisorSigma[1, #], # + 9] == 0 &] (* Michael De Vlieger, Jul 06 2016 *)

Extensions

a(7)-a(13) from Giovanni Resta, Jul 06 2016