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A139451
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Numbers n such that primorial(n)/2 + 256 is prime.
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5
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1, 3, 6, 7, 8, 13, 22, 33, 53, 58, 62, 142, 189, 220, 479, 496, 503, 760, 1464, 6503, 9477, 13861, 23881
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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k = 1/2; a = {}; Do[k = k*Prime[n]; If[PrimeQ[k + 256], Print[n]; AppendTo[a, n]], {n, 325}]; a
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(1)=1 inserted and program corrected, a(15)-a(19) from Ray Chandler, Jun 16 2013
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STATUS
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approved
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