id:A000286 - OEIS Search Results

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Number of positive integers <= 2^n of form 2 x^2 + 5 y^2.
(Formerly M3251 N1312)

+0
1

0, 1, 1, 4, 5, 11, 20, 36, 65, 119, 218, 412, 770, 1466, 2784, 5322, 10226, 19691, 38048, 73665, 142927, 277822, 540851, 1054502, 2058507, 4023164, 7871226, 15414517, 30213010, 59266164, 116343183, 228545303, 449240025, 883569304, 1738768584, 3423466797, 6743729031 (list; graph; listen)

	OFFSET	`0,4`
	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	`Adjacent sequences: A000283 A000284 A000285 this_sequence A000287 A000288 A000289` `Sequence in context: A118143 A001350 A077238 this_sequence A036539 A000769 A050831`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.

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