0,2

sigma_8(n) is the sum of the 8th powers of the divisors of n.

sigma[16j+8,x]/phi[x] is integer for j=0,..,500 and 6 actual terms of this sequence. Compare to A015759, A015762, A015770 and A091285. - Labos E. (labos(AT)ana.sote.hu), May 27 2004

Cf. A015759, A015762, A015770, A091285.

Sequence in context: A015762 A093038 A094469 this_sequence A117024 A023048 A083521

Adjacent sequences: A015763 A015764 A015765 this_sequence A015767 A015768 A015769

nonn

Robert G. Wilson v (rgwv(AT)rgwv.com)