A105846 - OEIS

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A105846

Numbers k such that 41*(k^2) + 41*k + 1 = n^2.

0, 704, 1344, 2887040, 5509760, 11831091264, 22578997184, 48483809114880, 92528724952320 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`Define a(1)=0, a(2)=704, a(3)=4098a(1)+2048-a(2), a(4)=4098a(2)+2048-a(1), then a(n)=4098*a(n-2)+2048-a(n-4)`
	CROSSREFS	`Cf. A105845.` `Sequence in context: A185571 A186923 A185807 * A185568 A185799 A186916` `Adjacent sequences: A105843 A105844 A105845 * A105847 A105848 A105849`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Apr 22 2005`

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Last modified February 15 12:25 EST 2012. Contains 205786 sequences.