A105838 - OEIS

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A105838

Numbers k such that 11*k^2 + 11*k + 1 = n^2, n sequence = A105837.

0, 39, 159, 15720, 63480, 6256719, 25265079, 2490158640, 10055438160, 991076882199 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`Define a(1)=0, a(2)=39, a(3)=398a(1)+198-a(2), a(4)=398a(2)+198-a(1) then a(n)=398*a(n-2)+198-a(n-4)`
	CROSSREFS	`Cf. A105837.` `Sequence in context: A128826 A158593 A158598 * A193228 A124619 A068975` `Adjacent sequences: A105835 A105836 A105837 * A105839 A105840 A105841`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Apr 22 2005`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.