id:A057769 - OEIS Search Results

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a(n) = 4*n^4+8*n^3-4*n-1 = (2*n^2-1)*(2*n^2+4*n+1).

+0
3

-1, 7, 119, 527, 1519, 3479, 6887, 12319, 20447, 32039, 47959, 69167, 96719, 131767, 175559, 229439, 294847, 373319, 466487, 576079, 703919, 851927, 1022119, 1216607, 1437599, 1687399, 1968407, 2283119, 2634127, 3024119, 3455879, 3932287, 4456319, 5031047, 5659639, 6345359, 7091567 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`It may be seen that the terms of the (signed) sequence consist of a subset of the odd squares minus two.`
	CROSSREFS	`a(n) = 4b(n)^2 - 4b(n) - 1 where b(n) = n-th pronic number A002378(n).` `Sequence in context: A076283 A097202 A163202 this_sequence A113667 A092612 A007751` `Adjacent sequences: A057766 A057767 A057768 this_sequence A057770 A057771 A057772`
	KEYWORD	`easy,sign`
	AUTHOR	`STUART M. ELLERSTEIN (ellerstein(AT)aol.com), Nov 01 2000`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Nov 02 2000`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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