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 A177093 Numbers n such that 9^n-8 is prime. 5
 2, 4, 7, 10, 11, 31, 127, 136, 215, 953, 1139, 1799, 3406, 7633, 13090, 13171, 13511, 32593 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(19) > 2*10^5. - Robert Price, Jul 29 2015 LINKS MAPLE A177093:=n->`if`(isprime(9^n-8), n, NULL): seq(A177093(n), n=1..10^3); # Wesley Ivan Hurt, Nov 14 2014 MATHEMATICA Select[Range[1000], PrimeQ[9^#-8] &] (* Vincenzo Librandi, Nov 15 2014 *) PROG (MAGMA) [n: n in [1..900]| IsPrime(9^n-8)] (PARI) is(n)=isprime(9^n-8) \\ Charles R Greathouse IV, Nov 15 2014 CROSSREFS Cf. A177094. Sequence in context: A295837 A321972 A288482 * A164903 A285968 A218772 Adjacent sequences:  A177090 A177091 A177092 * A177094 A177095 A177096 KEYWORD nonn,more AUTHOR Vincenzo Librandi, Nov 15 2010 EXTENSIONS Extended and crossref added by D. S. McNeil, Nov 15 2010 a(14)-a(18) from Robert Price, Jul 29 2015 STATUS approved

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Last modified January 26 21:14 EST 2022. Contains 350600 sequences. (Running on oeis4.)