id:A082849 - OEIS Search Results

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Product of cototient values of consecutive integers.

+0
1

0, 1, 2, 2, 4, 4, 4, 12, 18, 6, 8, 8, 8, 56, 56, 8, 12, 12, 12, 108, 108, 12, 16, 80, 70, 126, 144, 16, 22, 22, 16, 208, 234, 198, 264, 24, 20, 300, 360, 24, 30, 30, 24, 504, 504, 24, 32, 224, 210, 570, 532, 28, 36, 540, 480, 672, 630, 30, 44, 44, 32, 864, 864, 544, 782 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=A051953[n].A051952[n+1]`
	MATHEMATICA	`f[x_] := x-EulerPhi[x] tpr=Table[f[w+1]*f[w], {w, 1, 128}]`
	CROSSREFS	`Cf. A051953, A083538-A083555.` `Sequence in context: A129163 A083549 A083548 this_sequence A156130 A123756 A116648` `Adjacent sequences: A082846 A082847 A082848 this_sequence A082850 A082851 A082852`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), May 22 2003`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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