id:A080497 - OEIS Search Results

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a(n) = (n-p_1)(n-p_2)...(n-p_k) where p_k is the k-th prime and is also the largest prime < n.

+0
4

1, 1, 1, 2, 6, 12, 40, 90, 336, 840, 1728, 3150, 10560, 24948, 99840, 270270, 604800, 1201200, 4386816, 11277630, 49029120, 143896500, 348364800, 746876130, 2937876480, 8117240040, 18923520000, 39628338750, 76859228160, 140548508100 (list; graph; listen)

	OFFSET	`1,4`
	EXAMPLE	`a(6) = (6-2)(6-3)(6-5) = 12. a(7) = (7-2)(7-3)(7-5) = 40.`
	CROSSREFS	`Cf. A080498, A072513, A080500.` `Sequence in context: A162589 A123045 A094261 this_sequence A127724 A056744 A164859` `Adjacent sequences: A080494 A080495 A080496 this_sequence A080498 A080499 A080500`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 19 2003`
	EXTENSIONS	`More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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