id:A067781 - OEIS Search Results

Search: id:A067781

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Numbers n such that phi(n) and sigma(n) are simultaneously perfect squares.

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1, 170, 364, 679, 5044, 5130, 5670, 5770, 8721, 8736, 9154, 9639, 9809, 14322, 16376, 22413, 27783, 30256, 32025, 37114, 38760, 51455, 71604, 78570, 82615, 88392, 92004, 100821, 101153, 104168, 115430, 121056, 133569, 139954, 148568 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A subsequence of A011257. [From M. F. Hasler (mhasler(AT)univ-ag.fr), Sep 22 2009]`
	FORMULA	`A067781 = A006532 intersect A039770. [From M. F. Hasler (mhasler(AT)univ-ag.fr), Sep 22 2009]`
	CROSSREFS	`Cf. A006532, A039770.` `Sequence in context: A043762 A043771 A158221 this_sequence A031601 A043344 A045153` `Adjacent sequences: A067778 A067779 A067780 this_sequence A067782 A067783 A067784`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 07 2002`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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