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 A217073 Numbers n such that (n^23-1)/(n-1) is prime. 7
 10, 40, 82, 113, 127, 141, 170, 257, 275, 287, 295, 315, 344, 373, 442, 468, 609, 634, 646, 663, 671, 710, 819, 834, 857, 884, 894, 904, 992, 997, 1060, 1069, 1077, 1120, 1143, 1190, 1232, 1253, 1261, 1280, 1291, 1347, 1407, 1436, 1448, 1483, 1514, 1570, 1642 (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, 1700], PrimeQ[(#^23 - 1)/(# - 1)] &] (* T. D. Noe, Sep 26 2012 *) PROG (MAGMA) [n: n in [2..1700] |IsPrime((n^23 - 1) div (n - 1))]; // Vincenzo Librandi, Sep 28 2012 (PARI) is(n)=isprime((n^23-1)/(n-1)) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A002384, A049409, A100330, A162862, A217070-A217089. Sequence in context: A108777 A000132 A305131 * A210376 A060317 A033583 Adjacent sequences:  A217070 A217071 A217072 * A217074 A217075 A217076 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 October 16 20:34 EDT 2018. Contains 316275 sequences. (Running on oeis4.)