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 A217078 Numbers n such that (n^43-1)/(n-1) is prime. 6
 15, 21, 26, 86, 89, 114, 123, 163, 180, 310, 332, 377, 409, 438, 448, 457, 477, 526, 534, 556, 586, 612, 653, 665, 690, 692, 709, 760, 783, 803, 821, 848, 877, 899, 909, 942, 981, 1041, 1042, 1043, 1066, 1068, 1069, 1106, 1126, 1139, 1197, 1310, 1386, 1476, 1561 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Range[2, 1600], PrimeQ[(#^43 - 1)/(# - 1)] &] (* T. D. Noe, Sep 26 2012 *) PROG (MAGMA) [n: n in [2..1600] |IsPrime((n^43 - 1) div (n - 1))]; // Vincenzo Librandi, Sep 28 2012 (PARI) is(n)=isprime((n^43-1)/(n-1)) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A002384, A049409, A100330, A162862, A217070-A217089. Sequence in context: A070811 A211375 A326387 * A138594 A131651 A134642 Adjacent sequences:  A217075 A217076 A217077 * A217079 A217080 A217081 KEYWORD nonn,easy AUTHOR Tim Johannes Ohrtmann, Sep 26 2012 EXTENSIONS More terms from T. D. Noe, Sep 26 2012 STATUS approved

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Last modified December 5 22:37 EST 2019. Contains 329782 sequences. (Running on oeis4.)