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A139463
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Numbers n such that (product of the first n odd primes) - 2*prime(n+2) is a prime.
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4
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3, 4, 6, 10, 15, 42, 49, 56, 63, 106, 170, 182, 246, 255
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 3 is in the sequence because 3*5*7 - 2*11 = 83 is a prime.
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MATHEMATICA
| k = 1; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k - 2*Prime[n + 1]], AppendTo[a, n - 1]], {n, 2, 2000}]; a (*Artur Jasinski*)
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CROSSREFS
| Cf. A067026, A067027, A139439, A139440, A139441, A139442, A139443, A139444, A139445, A139446, A139447, A139448, A139449, A139450, A139451, A139452, A139453, A139454, A139455, A139456, A139457, A103514, A139460, A139461, A139462, A139463.
Sequence in context: A059618 A114736 A099417 * A068922 A032408 A018908
Adjacent sequences: A139460 A139461 A139462 * A139464 A139465 A139466
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 22 2008
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EXTENSIONS
| Edited by Jens Kruse Andersen (jens.k.a(AT)get2net.dk), May 03 2008
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