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A076679
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Numbers k such that 3*k! + 1 is prime.
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9
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2, 3, 4, 6, 7, 9, 10, 13, 23, 25, 32, 38, 40, 47, 96, 3442, 4048, 4522, 4887, 7033, 9528, 12915, 31762
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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k = 6 is here because 3*6! + 1 = 2161 is prime.
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PROG
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(PARI) isok(n) = isprime(3*n! + 1); \\ Michel Marcus, Nov 13 2016
(PFGW) ABC2 3*$a!+1
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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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Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 25 2002
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EXTENSIONS
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STATUS
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approved
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