id:A077020 - OEIS Search Results

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a(n) is the unique odd positive solution x of 2^n = 7x^2+y^2.

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1, 1, 1, 3, 1, 5, 7, 3, 17, 11, 23, 45, 1, 91, 89, 93, 271, 85, 457, 627, 287, 1541, 967, 2115, 4049, 181, 8279, 7917, 8641, 24475, 7193, 41757, 56143, 27371, 139657, 84915, 194399, 364229, 24569, 753027, 703889, 802165, 2209943, 605613 (list; graph; listen)

	OFFSET	`3,4`
	REFERENCES	`A. Engel, Problem-Solving Strategies. p. 126.`
	LINKS	`Eric Weisstein's World of Mathematics, Diophantine Equations 2nd Powers`
	EXAMPLE	`a(3)=1 since 2^3=8=71^2+1^2, a(6)=3 since 2^6=64=73^2+1^2.`
	CROSSREFS	`a(n)=abs(A001607(n-2)).` `Cf. A077021.` `Sequence in context: A038871 A134249 A001607 this_sequence A107920 A021080 A049764` `Adjacent sequences: A077017 A077018 A077019 this_sequence A077021 A077022 A077023`
	KEYWORD	`nonn`
	AUTHOR	`Ed Pegg Jr. (ed(AT)mathpuzzle.com), Oct 17, 2002`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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