id:A090779 - OEIS Search Results

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Numbers n such that n divides phi(n)^2.

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1, 4, 8, 9, 16, 18, 25, 27, 32, 36, 49, 50, 54, 64, 72, 81, 98, 100, 108, 121, 125, 128, 144, 147, 162, 169, 196, 200, 216, 225, 242, 243, 250, 256, 288, 289, 294, 324, 338, 343, 361, 392, 400, 432, 441, 450, 484, 486, 500, 507, 512, 529, 576, 578, 588, 605, 625 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Coincides with A073539 in the first 850000 entries and possibly more. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 08 2008]`
	FORMULA	`a(n) seems to be asymptotic to c*n^2 with c=0.1....`
	CROSSREFS	`Adjacent sequences: A090776 A090777 A090778 this_sequence A090780 A090781 A090782` `Sequence in context: A140269 A070003 A073539 this_sequence A166402 A034038 A069265`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 08 2004`

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Last modified November 8 20:39 EST 2009. Contains 166234 sequences.

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