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A139440
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Numbers n such that primorial(n)/2 - 4 is prime.
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24
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3, 4, 5, 7, 12, 15, 26, 31, 50, 71, 186, 273, 366
(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 - 4], Print[n]; AppendTo[a, n]], {n, 2, 366}]; 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: A092859 A173444 A120424 * A102607 A079463 A190213
Adjacent sequences: A139437 A139438 A139439 * A139441 A139442 A139443
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KEYWORD
| nonn
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AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Apr 21 2008
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