id:A083096 - OEIS Search Results

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Numbers n such that 3 divides sum(k=1,n, C(2k,k) ).

+0
8

0, 12, 30, 36, 84, 90, 108, 120, 246, 252, 270, 282, 324, 336, 354, 360, 732, 738, 756, 768, 810, 822, 840, 846, 972, 984, 1002, 1008, 1056, 1062, 1080, 1092, 2190, 2196, 2214, 2226, 2268, 2280, 2298, 2304, 2430, 2442, 2460, 2466, 2514, 2520, 2538, 2550 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Apparently a(n)/3 (mod 3) = A010060(n), the Thue-Morse sequence`
	FORMULA	`It appears that sequence gives n such that the coefficient of x^n equals 1 in prod (k>=1, 1-x^(3^k))`
	CROSSREFS	`Cf. A066796, A083097, A081601.` `Sequence in context: A049725 A050689 A115912 this_sequence A145469 A024364 A093507` `Adjacent sequences: A083093 A083094 A083095 this_sequence A083097 A083098 A083099`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 22 2003`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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