id:A065986 - OEIS Search Results

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Numbers n such that Sigma(n) = EulerPhi(n+1) + EulerPhi(n) + EulerPhi(n-1).

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6, 147, 286, 376, 534, 738, 805, 2392, 2406, 4324, 8214, 9606, 10362, 12126, 16263, 17511, 27639, 29151, 39215, 48616, 60687, 61132, 61915 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`Sigma(6) = 12 = 6 + 2 + 4 = EulerPhi(7) + EulerPhi(6) + EulerPhi(5).`
	CROSSREFS	`Cf. A000010.` `Adjacent sequences: A065983 A065984 A065985 this_sequence A065987 A065988 A065989` `Sequence in context: A121473 A063419 A099185 this_sequence A012791 A089480 A056427`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 10 2001`

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Last modified October 6 12:54 EDT 2008. Contains 144667 sequences.

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