id:A043293 - OEIS Search Results

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Numbers n such that LCM(sigma(n),phi(n)) is a perfect square.

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1, 3, 10, 17, 70, 170, 210, 357, 364, 416, 456, 577, 679, 1092, 1154, 1358, 1672, 1705, 1820, 2280, 2387, 2565, 2652, 2835, 2885, 2910, 3395, 3570, 4212, 4577, 4774, 4947, 5016, 5044, 5115, 5130, 5412, 5670, 5770, 5863, 6188, 6790, 7072, 7161, 7471, 7546 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`If n is in the sequence and n>10 LCM(sigma(n),phi(n))==0 (mod 6)`
	FORMULA	`n such that sqrt(A009286(n))=floor(sqrt(A009286(n)))`
	CROSSREFS	`Cf. A009286.` `Sequence in context: A047702 A017017 A003615 this_sequence A128701 A030390 A063220` `Adjacent sequences: A043290 A043291 A043292 this_sequence A043294 A043295 A043296`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 04 2002`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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