A082473 - OEIS

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A082473

Numbers n such that n=phi(x)*core(x) for some x<=n, where phi(x) is the Euler totient function and core(x) the squarefree part of x.

1, 2, 6, 8, 12, 20, 32, 40, 42, 48, 54, 84, 108, 110, 120, 128, 156, 160, 192, 220, 240, 252, 272, 312, 336, 342, 432, 486, 500, 504, 506, 512, 544, 640, 660, 684, 768, 812, 840, 880, 930, 936, 960, 972, 1000, 1012, 1080, 1248, 1320, 1332, 1344, 1624, 1632 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Also numbers n such that n = y*phi(y) for an unique positive integer y (see A194507) - Franz Vrabec, Aug 27 2011`
	LINKS	`Alois P. Heinz, Table of n, a(n) for n = 1..1000`
	CROSSREFS	`Cf. A000010, A007913, A194507.` `Sequence in context: A093006 A177869 A138639 * A113462 A065392 A030457` `Adjacent sequences: A082470 A082471 A082472 * A082474 A082475 A082476`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 27 2003`

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Last modified February 13 10:20 EST 2012. Contains 205451 sequences.