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A076189
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Numbers k such that k!! + 2^4 is prime.
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12
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0, 1, 3, 5, 13, 17, 25, 27, 39, 45, 47, 53, 177, 217, 401, 637, 729, 787, 843, 3407, 8835, 10283, 14061, 21951
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OFFSET
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1,3
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COMMENTS
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a(1)=0 since 0!!=1 and 1 + 2^4 = 17 is prime. - Robert Price, Jan 19 2015
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LINKS
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MAPLE
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select(t -> isprime(doublefactorial(t)+16), [$0..1000]); # Robert Israel, Jan 19 2015
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MATHEMATICA
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lst={}; Do[If[PrimeQ[n!!+2^4], AppendTo[lst, n]], {n, 0, 50000}]; lst
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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8835 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008
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STATUS
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approved
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