id:A053196 - OEIS Search Results

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Cototients of even numbers.

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1, 2, 4, 4, 6, 8, 8, 8, 12, 12, 12, 16, 14, 16, 22, 16, 18, 24, 20, 24, 30, 24, 24, 32, 30, 28, 36, 32, 30, 44, 32, 32, 46, 36, 46, 48, 38, 40, 54, 48, 42, 60, 44, 48, 66, 48, 48, 64, 56, 60, 70, 56, 54, 72, 70, 64, 78, 60, 60, 88, 62, 64, 90, 64, 82, 92, 68, 72, 94, 92, 72, 96 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Not all even numbers arise as cototient values: see A005278.`
	FORMULA	`a(n) = 2n - EulerPhi[2n] = A051953(2n)`
	EXAMPLE	`a(6)=a(7)=a(8)=cototient[12]= cototient[14]= cototient[16]=12-4=14-6=16-8=8`
	CROSSREFS	`A000010, A051953, A005278.` `Sequence in context: A089003 A132118 A007843 this_sequence A159634 A002131 A063200` `Adjacent sequences: A053193 A053194 A053195 this_sequence A053197 A053198 A053199`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Mar 02 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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