id:A053193 - OEIS Search Results

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Cototient of odd numbers.

+0
3

1, 1, 1, 3, 1, 1, 7, 1, 1, 9, 1, 5, 9, 1, 1, 13, 11, 1, 15, 1, 1, 21, 1, 7, 19, 1, 15, 21, 1, 1, 27, 17, 1, 25, 1, 1, 35, 17, 1, 27, 1, 21, 31, 1, 19, 33, 23, 1, 39, 1, 1, 57, 1, 1, 39, 1, 27, 45, 23, 11, 43, 25, 1, 45, 1, 25, 63, 1, 1, 49, 23, 33, 63, 1, 1, 57, 35, 1, 55, 29, 1, 85, 1, 13 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`a(n)=cototient[2n+1]=A051953(2n+1)`
	EXAMPLE	`n=12, 2n+1=25, Phi(25)=20, Cototient(25)=25-20=5, a(12)=5 n=16, 2n+1=33, Phi(33)=20, Cototient(33)=33-20=13, a(16)=13`
	CROSSREFS	`A051953.` `Sequence in context: A123354 A120247 A102479 this_sequence A010273 A046143 A071812` `Adjacent sequences: A053190 A053191 A053192 this_sequence A053194 A053195 A053196`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Mar 02 2000`

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Last modified November 22 20:51 EST 2009. Contains 167312 sequences.

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