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Search: id:A139451
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| A139451 |
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Numbers n such that primorial(n)/2 + 256 is prime. |
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+0
24
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| 3, 6, 7, 8, 13, 22, 33, 53, 58, 62, 142, 189, 220
(list; graph; listen)
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OFFSET
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1,1
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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: A047283 A047557 A099850 this_sequence A081291 A034091 A111717
Adjacent sequences: A139448 A139449 A139450 this_sequence A139452 A139453 A139454
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 21 2008
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