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 A058025 Numbers k such that 3*13^k - 2 is prime. 1
 1, 5, 11, 16, 59, 239, 299, 2524, 2695, 7657, 14028 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The next terms are > 15000. - Jinyuan Wang, Feb 02 2020 LINKS EXAMPLE 3(13^5) - 2 = 1113877, which is a prime number, hence 5 is in the sequence. 3(13^7) - 2 = 188245549, but that is divisible by 211, hence 7 is NOT in the sequence. MATHEMATICA Do[ If[ PrimeQ[ 3*13^n - 2 ], Print[ n ] ], {n, 0, 1500} ] (* RGWv *) Select[Range[0, 4000], PrimeQ[(3*13^# - 2)] &] (* Vincenzo Librandi, Sep 28 2012 *) PROG (PARI) is(n)=ispseudoprime(3*13^n-2) \\ Charles R Greathouse IV, Jun 13 2017 CROSSREFS Cf. A057871 (3*13^k + 2 is prime). Sequence in context: A041046 A041117 A041491 * A042121 A123082 A084037 Adjacent sequences: A058022 A058023 A058024 * A058026 A058027 A058028 KEYWORD nonn,more AUTHOR Robert G. Wilson v, Nov 15 2000 EXTENSIONS a(8)-a(9) from Vincenzo Librandi, Sep 28 2012 a(10) from Bruno Berselli, Sep 28 2012 a(11) from Jinyuan Wang, Feb 02 2020 STATUS approved

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Last modified February 3 18:41 EST 2023. Contains 360044 sequences. (Running on oeis4.)