1,2

Indranil Ghosh, Table of n, a(n) for n = 1..10000

a(n) = mod(A000203(n), 30).

Table[Mod[DivisorSigma[1, n], 30], {n, 120}] (* Michael De Vlieger, Jan 10 2017 *)

(PARI) a(n) = sigma(n) % 30; \\ Michel Marcus, Dec 19 2013

Cf. A084301, A084303, A000203, A097012, A097013, A097014, A097015.

Sequence in context: A076887 A140782 A284587 * A074847 A325317 A325316

Adjacent sequences: A097008 A097009 A097010 * A097012 A097013 A097014

nonn

Labos Elemer, Aug 19 2004

approved