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A089130
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Primes of the form (n! + 2)/2.
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43
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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PROG
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(PARI) nfactp2d2(n) = { for(x=1, n, y=floor((x!+ 2)/2); if(isprime(y), print1(y", ")) ) }
(Magma) [ a: n in [1..50] | IsPrime(a) where a is (Factorial(n)+2) div 2 ];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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