id:A154782 - OEIS Search Results

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Least integer y>=0 such that n+2y^2 is a square; -1 if n is not in A035251.

+0
1

0, 0, 1, -1, 0, -1, -1, 1, 2, 0, -1, -1, -1, -1, 1, -1, 0, 2, 3, -1, -1, -1, -1, 1, -1, 0, -1, -1, 2, -1, -1, 3, 4, -1, 1, -1, 0, -1, -1, -1, -1, 2, -1, -1, -1, -1, 3, 1, -1, 0, 5, -1, -1, -1, -1, -1, 2, -1, -1, -1, -1, -1, 1, 3, 0, -1, -1, -1, 4, -1, -1, 5, 6, 2, -1, -1, -1, -1, -1, 1, -1, 0 (list; graph; listen)

	OFFSET	`0,9`
	PROGRAM	`(PARI) A154782(n)={for(y=0, sqrtint(n\2), issquare(n+2*y^2)&return(y)); -1}`
	CROSSREFS	`Cf. A035251.` `Sequence in context: A056175 A105241 A134541 this_sequence A144474 A070200 A025914` `Adjacent sequences: A154779 A154780 A154781 this_sequence A154783 A154784 A154785`
	KEYWORD	`sign`
	AUTHOR	`M. F. Hasler (MHasler(AT)univ-ag.fr), Jan 19 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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