id:A079334 - OEIS Search Results

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Numbers n such that n divides tau(n) and n+1 divides tau(n+1), where tau(n)=A000594(n) is Ramanujan's tau function; i.e. n and n+1 are in A063938.

+0
2

1, 2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 20, 24, 27, 35, 48, 49, 63, 80, 90, 91, 125, 160, 161, 224, 440, 728, 735, 2024, 2400, 2744, 4095, 4374, 12879, 13824, 20735, 30624 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.`
	MATHEMATICA	(* First do <<NumberTheory`Ramanujan` *) test[n_] := Mod[RamanujanTau[n], n]==0; Select[Range[33000], test[ # ]&&test[ #+1]&]
	CROSSREFS	`Cf. A000594, A063938.` `Sequence in context: A032987 A092597 A125506 this_sequence A085153 A130010 A033081` `Adjacent sequences: A079331 A079332 A079333 this_sequence A079335 A079336 A079337`
	KEYWORD	`nonn`
	AUTHOR	`Dean Hickerson (dean(AT)math.ucdavis.edu), Jan 03 2003`
	EXTENSIONS	`No other terms <212000, Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 06 2002`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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