id:A093312 - OEIS Search Results

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Least k such that (2n+2k)+1 and (2n*2k) +1 are both primes.

+0
2

1, 9, 3, 1, 3, 3, 1, 3, 2, 1, 9, 2, 1, 6, 3, 4, 6, 8, 10, 3, 5, 1, 3, 2, 1, 3, 12, 1, 15, 5, 13, 9, 3, 1, 18, 3, 4, 3, 2, 4, 33, 2, 1, 12, 3, 7, 6, 3, 1, 3, 2, 16, 15, 2, 13, 9, 17, 25, 15, 5, 4, 6, 26, 1, 9, 8, 1, 30, 5, 16, 3, 2, 1, 15, 6, 7, 12, 3, 7, 15, 5, 7, 3, 2, 4, 3, 12, 1, 6, 5, 7, 36, 3, 22 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`a(4) = 1, 8+22 +1 =11 and 82*2 +1 = 17 are both prime.`
	MATHEMATICA	`f[n_] := Block[{k = 1}, While[ !PrimeQ[2n + 2k + 1] \|\| ! PrimeQ[2n*2k + 1], k++ ]; k]; Table[ f[n], {n, 95}] (from Robert G. Wilson v Apr 24 2004)`
	CROSSREFS	`A093481/2.` `Sequence in context: A010159 A097528 A065416 this_sequence A154629 A154489 A085579` `Adjacent sequences: A093309 A093310 A093311 this_sequence A093313 A093314 A093315`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 14 2004`
	EXTENSIONS	`Edited, corrected and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 24 2004`

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

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