id:A031396 - OEIS Search Results

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Numbers n such that Pell equation x^2 - n y^2 = -1 is soluble.

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1, 2, 5, 10, 13, 17, 26, 29, 37, 41, 50, 53, 58, 61, 65, 73, 74, 82, 85, 89, 97, 101, 106, 109, 113, 122, 125, 130, 137, 145, 149, 157, 170, 173, 181, 185, 193, 197, 202, 218, 226, 229, 233, 241, 250, 257, 265, 269, 274, 277, 281, 290, 293, 298 (list; graph; listen)

	OFFSET	`1,2`
	REFERENCES	`Harvey Cohn, "Advanced Number Theory".`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000` `S. R. Finch, Class number theory`
	FORMULA	`Terms are divisible neither by 4 nor by a prime of form 4*k + 3 (although these conditions are not sufficient - compare A031398). - Lekraj Beedassy (blekraj(AT)yahoo.com), Aug 17 2005`
	CROSSREFS	`{1} U A003814.` `Cf. A031398.` `Adjacent sequences: A031393 A031394 A031395 this_sequence A031397 A031398 A031399` `Sequence in context: A008784 A020893 A003814 this_sequence A003654 A047617 A135467`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net)`

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

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