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A139451
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Numbers n such that primorial(n)/2 + 256 is prime.
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24
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3, 6, 7, 8, 13, 22, 33, 53, 58, 62, 142, 189, 220
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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MATHEMATICA
| 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
| 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: A189659 A157041 A189098 * A081291 A189095 A188968
Adjacent sequences: A139448 A139449 A139450 * A139452 A139453 A139454
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 21 2008
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