id:A000047 - OEIS Search Results

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Number of integers <= 2^n of form x^2 - 2y^2.
(Formerly M0701 N0259)

+0
2

1, 2, 3, 5, 8, 15, 26, 48, 87, 161, 299, 563, 1066, 2030, 3885, 7464, 14384, 27779, 53782, 104359, 202838, 394860, 769777, 1502603, 2936519, 5744932 (list; graph; listen)

	OFFSET	`0,2`
	REFERENCES	`D. Shanks and L. P. Schmid, Variations on a theorem of Landau. Part I, Math. Comp., 20 (1966), 551-569.`
	LINKS	`Index entries for sequences related to populations of quadratic forms`
	CROSSREFS	`Sequence in context: A006982 A054539 A026702 this_sequence A101172 A006544 A110536` `Adjacent sequences: A000044 A000045 A000046 this_sequence A000048 A000049 A000050`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.

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