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 A217135 Numbers n such that 3^n - 8 is prime. 17
 3, 4, 7, 8, 14, 20, 22, 62, 139, 254, 272, 430, 907, 1906, 2278, 2827, 3598, 6812, 15266, 20915, 26180, 26342, 27022, 48275, 65186, 69247, 86647 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(28) > 2*10^5. - Robert Price, Sep 02 2013 LINKS MATHEMATICA Select[Range[2, 5000], PrimeQ[3^# - 8] &] PROG (PARI) for(n=2, 5*10^3, if(isprime(3^n-8), print1(n", "))) CROSSREFS Cf. A014224, A051783, A058958, A058959. Sequence in context: A114210 A073271 A117471 * A323247 A285662 A112062 Adjacent sequences:  A217132 A217133 A217134 * A217136 A217137 A217138 KEYWORD nonn AUTHOR Vincenzo Librandi, Oct 01 2012 EXTENSIONS a(18)-a(27) from Robert Price, Sep 02 2013 STATUS approved

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)