id:A085758 - OEIS Search Results

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Least m such that phi(x)=2m has exactly n solutions.

+0
2

5, 1, 2, 4, 6, 16, 18, 20, 12, 24, 80, 198, 1134, 352, 156, 36, 168, 108, 468, 72, 312, 528, 880, 180, 1280, 192, 144, 660, 1848, 120, 384, 4500, 216, 3564, 2100, 240, 288, 648, 600, 7968, 1656, 1536, 1620, 432, 1560, 3672, 1944, 360, 840, 2496, 8820, 1008, 576 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`Sequence refers to the rank of the first occurrence of n in A032446.`
	FORMULA	`a(n) = A007374(n)/2 for n > 2. - David Wasserman (wasserma(AT)spawar.navy.mil), Feb 09 2005`
	EXAMPLE	`a(0) = 7. Carmichael conjectured that a(1) doesn't exist.`
	CROSSREFS	`Cf. A032446.` `Sequence in context: A055185 A120579 A093316 this_sequence A154529 A157823 A159703` `Adjacent sequences: A085755 A085756 A085757 this_sequence A085759 A085760 A085761`
	KEYWORD	`nonn`
	AUTHOR	`Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 22 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Feb 09 2005`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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