The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A217085 Numbers n such that (n^73-1)/(n-1) is prime. 6
 11, 15, 75, 114, 195, 215, 295, 335, 378, 559, 566, 650, 660, 832, 871, 904, 966, 1021, 1112, 1203, 1334, 1433, 1485, 1724, 1822, 1959, 1998, 2115, 2154, 2432, 2465, 2486, 2544, 2559, 2564, 2575, 2611, 2681, 2705, 2735, 2754, 2806, 2880, 3158, 3222, 3306, 3368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS G. C. Greubel, Table of n, a(n) for n = 1..5000 (terms 1..500 from Vincenzo Librandi) MATHEMATICA Select[Range[2, 1000], PrimeQ[(#^73 - 1)/(# - 1)] &] (* T. D. Noe, Sep 26 2012 *) PROG (PARI) is(n)=isprime((n^73-1)/(n-1)) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Cf. A002384, A049409, A100330, A162862, A217070-A217089. Sequence in context: A068483 A241679 A219389 * A267123 A115779 A147339 Adjacent sequences:  A217082 A217083 A217084 * A217086 A217087 A217088 KEYWORD nonn AUTHOR Tim Johannes Ohrtmann, Sep 26 2012 EXTENSIONS More terms from T. D. Noe, Sep 26 2012 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 11 13:21 EDT 2021. Contains 343791 sequences. (Running on oeis4.)