id:A065093 - OEIS Search Results

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Convolution of A000010 with itself.

+0
2

1, 2, 5, 8, 16, 20, 36, 44, 68, 76, 120, 124, 188, 196, 276, 272, 404, 380, 544, 532, 716, 668, 968, 860, 1184, 1120, 1472, 1332, 1896, 1624, 2204, 2036, 2656, 2352, 3284, 2752, 3684, 3356, 4324, 3744, 5192, 4312, 5720, 5180, 6540, 5628, 7768, 6388, 8476 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Sum_{k=1..n} phi(k)*phi(n+1-k), where phi is Euler totient function (A000010).`
	CROSSREFS	`Cf. A000385, A055507.` `Sequence in context: A051293 A081660 A080084 this_sequence A129299 A096541 A137685` `Adjacent sequences: A065090 A065091 A065092 this_sequence A065094 A065095 A065096`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 11 2001`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

AT&T Labs Research