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 A217081 Numbers n such that (n^59-1)/(n-1) is prime. 6
 19, 70, 102, 116, 126, 188, 209, 257, 294, 359, 451, 461, 468, 470, 638, 653, 710, 762, 766, 781, 824, 901, 939, 964, 995, 1036, 1047, 1098, 1150, 1211, 1234, 1243, 1256, 1278, 1389, 1401, 1422, 1436, 1454, 1492, 1523, 1639, 1703, 1705, 1826, 1913, 1915, 1978 (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, 2000], PrimeQ[(#^59 - 1)/(# - 1)] &] (* T. D. Noe, Sep 26 2012 *) PROG (MAGMA) [n: n in [2..2000] |IsPrime((n^59 - 1) div (n - 1))]; // Vincenzo Librandi, Sep 28 2012 (PARI) is(n)=isprime((n^59-1)/(n-1)) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A002384, A049409, A100330, A162862, A217070-A217089. Sequence in context: A204675 A007546 A007547 * A010007 A172078 A196136 Adjacent sequences:  A217078 A217079 A217080 * A217082 A217083 A217084 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 10 20:55 EST 2018. Contains 318049 sequences. (Running on oeis4.)