id:A071558 - OEIS Search Results

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Smallest k such that nk+1 and nk-1 are simultaneously primes.

+0
2

4, 2, 2, 1, 6, 1, 6, 9, 2, 3, 18, 1, 24, 3, 2, 12, 6, 1, 12, 3, 2, 9, 6, 3, 6, 12, 4, 15, 12, 1, 42, 6, 6, 3, 12, 2, 54, 6, 8, 6, 30, 1, 24, 15, 4, 3, 6, 4, 18, 3, 2, 6, 120, 2, 12, 48, 4, 6, 18, 1, 258, 21, 14, 3, 30, 3, 24, 15, 2, 6, 18, 1, 84, 27, 2, 3, 6, 4, 132, 3, 10, 15, 54, 5, 12, 12 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	PROGRAM	`(PARI) for(n=1, 100, s=1; while(isprime(sn+1)isprime(n*s-1)==0, s++); print1(s, ", "))`
	CROSSREFS	`Cf. A071256` `Adjacent sequences: A071555 A071556 A071557 this_sequence A071559 A071560 A071561` `Sequence in context: A123402 A088570 A102888 this_sequence A136709 A137239 A136714`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), May 30 2002`

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Last modified November 8 19:30 EST 2009. Contains 166227 sequences.

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