id:A058979 - OEIS Search Results

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Number of m such that phi(m) = 4n.

+0
1

4, 5, 6, 6, 5, 10, 2, 7, 8, 9, 3, 11, 2, 3, 9, 8, 0, 17, 0, 10, 6, 6, 3, 17, 4, 3, 9, 6, 3, 17, 0, 9, 7, 2, 3, 21, 2, 0, 7, 12, 3, 12, 2, 8, 10, 4, 0, 21, 2, 8, 3, 4, 3, 19, 5, 8, 2, 6, 0, 31, 0, 0, 9, 10, 3, 10, 2, 5, 9, 8, 0, 28, 2, 3, 5, 0, 0, 16, 2, 16, 8, 4, 3, 18, 0, 3, 6, 12, 3, 25, 0, 5, 2, 0 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Size of invphi(4n) solution-set.`
	EXAMPLE	`4n=48: invphi(48) has 11 solutions: {65,104,105,112,130,140,144,156,168,180,210} The value of the "nops(invphi(4k))" number seems to take any integer except 1.`
	MAPLE	`with(numtheory): [seq(nops(invphi(4*k)), k=1...256)];`
	CROSSREFS	`A000010, A005277.` `Sequence in context: A134299 A112780 A021223 this_sequence A046343 A022911 A162310` `Adjacent sequences: A058976 A058977 A058978 this_sequence A058980 A058981 A058982`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Jan 15 2001`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

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