id:A066862 - OEIS Search Results

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Numbers n such that n divides sum(i=1,n,gcd(n,i))=A018804(n).

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1, 4, 15, 16, 27, 48, 60, 64, 108, 144, 240, 256, 325, 432, 729, 891, 960, 1008, 1024, 1200, 1280, 1296, 1300, 1728, 1875, 2916, 3072, 3125, 3564, 3645, 3840, 3888, 4095, 4096 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also n such that sum(d\|n,phi(d)/d) is an integer. - Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 14 2002`
	FORMULA	`if n=4^k k>=0 n is in the sequence.`
	CROSSREFS	`Sequence in context: A152442 A161769 A135658 this_sequence A103540 A065159 A051956` `Adjacent sequences: A066859 A066860 A066861 this_sequence A066863 A066864 A066865`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 25 2002`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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