id:A082465 - OEIS Search Results

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Least k>=1 such that n^2+kn+1 is prime.

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1, 1, 1, 3, 1, 1, 3, 1, 3, 3, 7, 1, 11, 1, 1, 5, 1, 3, 3, 1, 1, 6, 3, 1, 3, 7, 1, 6, 3, 3, 5, 4, 1, 3, 7, 7, 3, 1, 9, 3, 1, 4, 3, 3, 3, 5, 3, 6, 3, 1, 5, 3, 3, 1, 3, 4, 1, 3, 1, 7, 5, 1, 3, 3, 3, 1, 3, 7, 1, 9, 1, 7, 9, 9, 1, 12, 1, 1, 5, 1, 5, 3, 19, 3, 3, 4, 7, 3, 1, 1, 5, 3, 3, 11, 3, 4, 11, 6, 1, 3, 1, 3, 11 (list; graph; listen)

	OFFSET	`1,4`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, k=1; while(isprime(n^2+k*n+1)==0, s++); k)`
	CROSSREFS	`Sequence in context: A131775 A035691 A131781 this_sequence A131327 A122506 A010274` `Adjacent sequences: A082462 A082463 A082464 this_sequence A082466 A082467 A082468`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 27 2003`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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