id:A069113 - OEIS Search Results

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Square-free part of C(2n,n), the central binomial numbers : the smallest number such that a(n)*C(2n,n) is a square.

+0
2

2, 6, 5, 70, 7, 231, 858, 1430, 12155, 46189, 176358, 676039, 104006, 44574, 1077205, 66786710, 64822395, 90751353, 353452638, 3829070245, 134564468610, 526024740930, 2287064091, 35830670759, 71661341518, 281132955186 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) for(n=1, 60, print1(core(binomial(2*n, n)), ", "))`
	CROSSREFS	`Cf. A007913.` `May be the same as A085057.` `Adjacent sequences: A069110 A069111 A069112 this_sequence A069114 A069115 A069116` `Sequence in context: A009460 A085205 A094595 this_sequence A085057 A009462 A111119`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 06 2002`

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Last modified October 5 16:50 EDT 2008. Contains 144613 sequences.

AT&T Labs Research