id:A133927 - OEIS Search Results

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Numbers n such that the sum of the first n Catalan numbes, C_1 + C_2 + ... + C_n, is divisible by n.

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1, 30, 494, 6331, 36851, 95450, 122614, 940745, 5126032, 7519204 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`The sum of the first 30 Catalan numbers, 1 + 2 + 5 + ... + 3814986502092304 = 5175497420902740, is divisible by 30, so 30 is a term.`
	LINKS	`Eric Weisstein's World of Mathematics, Catalan Number`
	CROSSREFS	`Cf. A000108.` `Sequence in context: A125487 A072976 A127544 this_sequence A082556 A036223 A022658` `Adjacent sequences: A133924 A133925 A133926 this_sequence A133928 A133929 A133930`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Ryan Propper (rpropper(AT)cs.stanford.edu), Jan 07 2008`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.