id:A082466 - OEIS Search Results

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Least k>=1 such that n^2+kn-1 and n^2+kn+1 are twin primes.

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3, 1, 1, 11, 1, 1, 53, 1, 3, 5, 7, 3, 11, 16, 1, 11, 43, 6, 11, 1, 1, 8, 13, 1, 17, 7, 3, 11, 43, 4, 11, 4, 7, 8, 31, 9, 17, 1, 9, 35, 1, 4, 53, 4, 7, 41, 43, 6, 23, 1, 17, 8, 67, 1, 5, 4, 17, 11, 1, 7, 197, 4, 3, 11, 25, 1, 227, 7, 3, 14, 157, 19, 11, 16, 3, 71, 43, 6, 53, 7, 7, 44, 31, 3, 41 (list; graph; listen)

	OFFSET	`1,1`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, k=1; while(isprime(n^2+kn+1)isprime(n^2+k*n-1)==0, s++); k)`
	CROSSREFS	`Sequence in context: A100265 A086766 A078688 this_sequence A120270 A113711 A103997` `Adjacent sequences: A082463 A082464 A082465 this_sequence A082467 A082468 A082469`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 27 2003`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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