id:A015771 - OEIS Search Results

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Phi(n) | Sigma_13(n).

+0
4

1, 2, 3, 6, 12, 14, 15, 30, 35, 42, 56, 70, 78, 105, 140, 168, 190, 210, 248, 264, 270, 357, 418, 420, 570, 594, 616, 630, 714, 744, 749, 812, 840, 910, 1045, 1240, 1254, 1485, 1498, 1672, 1848, 2090, 2214, 2247, 2376, 2436, 2568, 2580, 2730 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`sigma_13(n) is the sum of the 13th powers of the divisors of n.`
	MAPLE	`with(numtheory); a := []: for n from 1 to 3000 do if sigma[13](n) mod phi(n) = 0 then a := [op(a), n]; fi; od: a;`
	CROSSREFS	`Sequence in context: A015763 A015769 A015765 this_sequence A020492 A110590 A111271` `Adjacent sequences: A015768 A015769 A015770 this_sequence A015772 A015773 A015774`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com)`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

AT&T Labs Research