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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A058591 Numbers k such that 5*3^k - 2 is prime. 1 0, 1, 2, 5, 6, 8, 11, 12, 14, 17, 26, 47, 59, 65, 83, 92, 96, 110, 113, 186, 527, 834, 1274, 5124, 5750, 7616, 11328, 54287, 57186 (list; graph; refs; listen; history; text; internal format) OFFSET 1,3 COMMENTS No further terms <= 55000. - Serge Batalov, Oct 31 2010 a(30) > 2*10^5. - Robert Price, May 20 2015 LINKS Table of n, a(n) for n=1..29. MATHEMATICA Do[ If[ PrimeQ[ 5*3^n - 2 ], Print[ n ] ], {n, 0, 4200} ] PROG (Magma) [n: n in [0..1000] | IsPrime(5*3^n-2)]; // Vincenzo Librandi, May 21 2015 (PARI) is(n)=ispseudoprime(5*3^n-2) \\ Charles R Greathouse IV, Jun 13 2017 (PFGW) ABC2 5*3^$a - 2 a: from 0 to 10000 // Jinyuan Wang, Feb 01 2020 CROSSREFS Cf. A058590 (5*3^k + 2 is prime). Sequence in context: A132142 A045751 A047267 * A247062 A059009 A214642 Adjacent sequences: A058588 A058589 A058590 * A058592 A058593 A058594 KEYWORD nonn,more AUTHOR Robert G. Wilson v, Dec 26 2000 EXTENSIONS Corrected by and more PRP terms from Serge Batalov, Oct 31 2010 a(29) from Robert Price, May 20 2015 Added 0 from Vincenzo Librandi, May 21 2015 STATUS approved

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Last modified August 13 21:35 EDT 2024. Contains 375144 sequences. (Running on oeis4.)