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A139452
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Numbers n such that primorial(n)/2 - 256 is prime.
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24
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..10.
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MATHEMATICA
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k = 1; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k - 256], Print[n]; AppendTo[a, n]], {n, 2, 325}]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A067026, A067027, A139439, A139440, A139441, A139442, A139443, A139444, A139445, A139446, A139447, A139448, A139449, A139450, A139451, A139452, A139453, A139454, A139455, A139456, A139457, A103514.
Sequence in context: A204659 A134580 A007749 * A063506 A084438 A186700
Adjacent sequences: A139449 A139450 A139451 * A139453 A139454 A139455
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski, Apr 21 2008
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STATUS
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approved
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