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 A186106 Numbers k such that 3*6^k - 1 is prime. 1
 0, 1, 2, 3, 5, 6, 9, 12, 13, 24, 41, 71, 140, 189, 190, 630, 713, 1066, 1173, 1202, 1271, 1520, 1606, 2091, 2162, 2547, 6253, 7284, 8676, 10735, 12954, 22042, 32457, 36693, 50715, 72313 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS a(37) > 1*10^5. - Tyler NeSmith, Oct 03 2022 LINKS Table of n, a(n) for n=1..36. MATHEMATICA lst={}; Do[If[PrimeQ[(3*6^n-1)], Print[n]; AppendTo[lst, n]], {n, 10^5}]; PROG (PARI) is(n)=ispseudoprime(3*6^n-1) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS See A186104 for the actual primes; cf. A185167. Sequence in context: A366143 A086191 A074658 * A329161 A124866 A166247 Adjacent sequences: A186103 A186104 A186105 * A186107 A186108 A186109 KEYWORD nonn,more AUTHOR Gilbert Mozzo, Feb 12 2011 EXTENSIONS a(17)-a(25) computed by Bruno Berselli, Feb 12 2011 and Feb 21 2011 a(26)-a(33) computed by Gilbert Mozzo, Nov 16 2011 with Mathematica a(34)-a(35) computed by Gilbert Mozzo, Nov 08 2018 with PARI a(36) from Tyler NeSmith, Oct 03 2022 STATUS approved

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Last modified August 15 00:19 EDT 2024. Contains 375171 sequences. (Running on oeis4.)