id:A096304 - OEIS Search Results

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Numbers n such that 3n does not divide (6n-4)!/[(3n-2)!(3n-1)! ].

+0
3

1, 2, 3, 4, 5, 9, 10, 11, 12, 13, 14, 27, 28, 29, 30, 31, 32, 36, 37, 38, 39, 40, 41, 81, 82, 83, 84, 85, 86, 90, 91, 92, 93, 94, 95, 108, 109, 110, 111, 112, 113, 117, 118, 119, 120, 121, 122, 243, 244, 245, 246, 247, 248, 252, 253, 254, 255, 256, 257, 270, 271 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Equivalently, members of A019469 divisible by 3, divided by 3.`
	FORMULA	`a(n) = 9 * A005836([n/6]) + (n mod 6) (conjectured).`
	PROGRAM	`(PARI) for(n=1, 300, if(((6n-4)!/(3n-2)!/(3n-1)!)%(3n), print1(n", ")))`
	CROSSREFS	`Sequence in context: A068586 A068585 A037472 this_sequence A119955 A158573 A047603` `Adjacent sequences: A096301 A096302 A096303 this_sequence A096305 A096306 A096307`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan, Aug 03 2004`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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