A050269 - OEIS

This site is supported by donations to The OEIS Foundation.

A050269

Smallest value a for Diophantine 1-doubles (a,b) ordered by smallest b.

1, 2, 3, 4, 5, 1, 3, 6, 7, 8, 9, 2, 4, 10, 11, 12, 1, 8, 13, 3, 5, 14, 15, 16, 17, 4, 6, 18, 3, 8, 19, 20, 21, 1, 2, 5, 7, 12, 15, 22, 23, 24, 25, 6, 8, 26, 27, 4, 12, 28, 29, 7, 9, 30, 3, 16, 31, 32, 1, 24, 33, 8, 10, 34, 35, 36, 5, 16, 37, 2, 3, 9, 11, 21, 24, 38, 39, 4, 20, 40, 41 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.` `P. Gibbs, Diophantine quadruples and Cayley's hyperdeterminant.`
	PROG	`(PARI) an=vector(81); m=0; for(b=2, 43, for(a=1, b, if(issquare(a*b+1), an[ m++ ]=a))); an`
	CROSSREFS	`Cf. A050270.` `Sequence in context: A053827 A033926 A193042 * A097151 A071500 A071516` `Adjacent sequences: A050266 A050267 A050268 * A050270 A050271 A050272`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com)`

Content is available under The OEIS End-User License Agreement .

Last modified February 13 06:53 EST 2012. Contains 205451 sequences.