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A288405
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Primes of the form k!2+4, where k!2 is the double factorial number (A006852).
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1
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5, 7, 19, 109, 10399, 34459429, 6190283353629379, 319830986772877770815629, 563862029680583509947946879, 174865344543353986303948473285124243127671456831640629, 2987435000850314871976096554696085799164511452611632783323554397412109379
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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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MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] + 4, {i, 0, 100}], PrimeQ[#]&]
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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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