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Search: id:A139439
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| A139439 |
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Numbers n such that primorial(n)/2 + 4 is prime. |
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+0
24
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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+4], Print[n]; AppendTo[a, n]], {n, 2, 4*10^2}]; a [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 20 2008]
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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: A068194 A134459 A110705 this_sequence A119330 A084644 A100686
Adjacent sequences: A139436 A139437 A139438 this_sequence A139440 A139441 A139442
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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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