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A097011 Remainder of sigma(n) modulo 30. 5
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 (list; graph; refs; listen; history; text; internal format)
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: A076887 A140782 A284587 * A074847 A325317 A325316

Adjacent sequences:  A097008 A097009 A097010 * A097012 A097013 A097014

KEYWORD

nonn

AUTHOR

Labos Elemer, Aug 19 2004

STATUS

approved

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Last modified February 17 17:59 EST 2020. Contains 331999 sequences. (Running on oeis4.)