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 A243279 Numbers n such that (46^n - 1)/45 is prime. 5
 2, 7, 19, 67, 211, 433, 2437, 2719, 19531 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(10) > 10^5. Numbers corresponding to a(7)-a(9) are probable primes. All terms are prime. LINKS Harvey Dubner, Generalized repunit primes, Math. Comp., 61 (1993), 927-930. Henri Lifchitz, Mersenne and Fermat primes field MAPLE A243279:=n->`if`(isprime((46^n - 1)/45), n, NULL); seq(A243279(n), n=1..100000); # Wesley Ivan Hurt, Apr 12 2014 MATHEMATICA Select[Prime[Range[100000]], PrimeQ[(46^# - 1)/45] &] PROG (PARI) is(n)=ispseudoprime((46^n-1)/45) \\ Charles R Greathouse IV, May 22 2017 CROSSREFS Cf. A028491, A004061, A004062, A004063, A004023, A005808, A004064, A016054, A006032, A006033, A006034, A006035, A127995, A127996, A127997, A127998, A127999, A098438, A128002, A128003, A128004, A128005, A240765, A242797. Sequence in context: A083309 A318264 A164979 * A080873 A126162 A054423 Adjacent sequences:  A243276 A243277 A243278 * A243280 A243281 A243282 KEYWORD hard,more,nonn AUTHOR Robert Price, Jun 02 2014 STATUS approved

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Last modified May 21 17:17 EDT 2019. Contains 323444 sequences. (Running on oeis4.)