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A074627 Numbers n such that sigma(n) is divisible by 6. 7
5, 6, 10, 11, 14, 15, 17, 20, 22, 23, 24, 26, 29, 30, 33, 34, 35, 38, 40, 41, 42, 44, 45, 46, 47, 51, 53, 54, 55, 56, 58, 59, 60, 62, 65, 66, 68, 69, 70, 71, 74, 77, 78, 80, 82, 83, 85, 86, 87, 88, 89, 90, 92, 94, 95, 96, 99, 101, 102, 104, 105, 106, 107, 110, 113, 114, 115 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

n=10: sigma(10) = 1+2+5+10 = 18 = 3*6.

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000

FORMULA

A000203(n) modulo 6 = 0.

MATHEMATICA

Select[Range@ 120, Divisible[DivisorSigma[1, #], 6] &] (* Michael De Vlieger, Feb 25 2017 *)

PROG

(PARI) isok(n) = !(sigma(n) % 6); \\ Michel Marcus, Dec 17 2013

CROSSREFS

Cf. A000203, A072862, A074384, A074628, A074629, A074630.

Sequence in context: A042958 A265188 A163903 * A067612 A064957 A008851

Adjacent sequences:  A074624 A074625 A074626 * A074628 A074629 A074630

KEYWORD

easy,nonn

AUTHOR

Labos Elemer, Aug 26 2002

STATUS

approved

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Last modified May 19 08:25 EDT 2019. Contains 323389 sequences. (Running on oeis4.)