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 A076134 Numbers k such that 3*k! - 1 is prime. 11
 0, 1, 2, 3, 4, 5, 9, 12, 17, 26, 76, 379, 438, 1695, 6709, 13313, 18504, 19021, 24488, 45552, 49085 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS a(22) > 50000. - Roger Karpin, Nov 13 2016 LINKS EXAMPLE k = 5 is here because 3*5! - 1 = 359 is prime. MAPLE for n from 0 to 1000 do if isprime(3*n! - 1) then print(n) end if end do; MATHEMATICA Select[Range[0, 10^3], PrimeQ[3 #! - 1] &] (* Robert Price, May 27 2019 *) PROG (PARI) isok(n) = isprime(3*n! - 1); \\ Michel Marcus, Nov 13 2016 (PFGW) ABC2 3*\$a!+1 a: from 1 to 1000 // Jinyuan Wang, Feb 04 2020 CROSSREFS Cf. A051915, A076134. Cf. A002982, A076133, A099350, A099351, A180627, A180628, A180629, A180630, A180631. Sequence in context: A084542 A038201 A033084 * A239742 A101526 A264994 Adjacent sequences:  A076131 A076132 A076133 * A076135 A076136 A076137 KEYWORD nonn,more AUTHOR Phillip L. Poplin (plpoplin(AT)bellsouth.net), Oct 30 2002 EXTENSIONS a(15)-a(21) from Roger Karpin, Nov 13 2016 STATUS approved

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Last modified April 12 00:18 EDT 2021. Contains 342911 sequences. (Running on oeis4.)