A043293 - OEIS

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A043293

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

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; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`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 * A178644 A128701 A030390` `Adjacent sequences: A043290 A043291 A043292 * A043294 A043295 A043296`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 04 2002`

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Last modified February 16 21:51 EST 2012. Contains 205978 sequences.