A097011 Remainder of sigma(n) modulo 30.

1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 12, 28, 14, 24, 24, 1, 18, 9, 20, 12, 2, 6, 24, 0, 1, 12, 10, 26, 0, 12, 2, 3, 18, 24, 18, 1, 8, 0, 26, 0, 12, 6, 14, 24, 18, 12, 18, 4, 27, 3, 12, 8, 24, 0, 12, 0, 20, 0, 0, 18, 2, 6, 14, 7, 24, 24, 8, 6, 6, 24, 12, 15, 14, 24, 4, 20, 6, 18, 20, 6, 1, 6

Offset

1,2

Links

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

Formula

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

Mathematica

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

Prog

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

Crossrefs

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

Sequence in context: A351395 A140782 A284587 * A366992 A365682 A074847

Adjacent sequences: A097008 A097009 A097010 * A097012 A097013 A097014

Keyword

nonn

Author

Labos Elemer, Aug 19 2004

Status

approved