id:A051638 - OEIS Search Results

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Sum_{k=0..n} (C(n,k) mod 3).

+0
8

1, 2, 4, 2, 4, 8, 4, 8, 13, 2, 4, 8, 4, 8, 16, 8, 16, 26, 4, 8, 13, 8, 16, 26, 13, 26, 40, 2, 4, 8, 4, 8, 16, 8, 16, 26, 4, 8, 16, 8, 16, 32, 16, 32, 52, 8, 16, 26, 16, 32, 52, 26, 52, 80, 4, 8, 13, 8, 16, 26, 13, 26, 40, 8, 16, 26, 16, 32, 52, 26, 52, 80, 13 (list; graph; listen)

	OFFSET	`0,2`
	LINKS	`Michael Gilleland, Some Self-Similar Integer Sequences` `A. Granville, Binomials modulo a prime`
	FORMULA	`Write n in base 3; if the representation contains r 1's and s 2's then a(n) = 2^{r-1} * (3^(s+1) - 1) = 1/2 * (3*A006047(n) - 2^(A062756(n))). - Robin Chapman (rjc(AT)MATHS.EX.AC.UK), Ahmed Fares (ahmedfares(AT)my-deja.com) and others, Jul 16, 2001`
	CROSSREFS	`Cf. A001316.` `Sequence in context: A112791 A143107 A166242 this_sequence A155682 A151706 A055372` `Adjacent sequences: A051635 A051636 A051637 this_sequence A051639 A051640 A051641`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 17 13:29 EST 2009. Contains 170826 sequences.

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