This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A217079 #15 Sep 08 2022 08:46:04 %S A217079 5,17,19,55,62,75,89,98,99,132,172,186,197,220,268,278,279,288,439, %T A217079 443,496,579,583,587,742,777,825,911,966,1003,1029,1155,1202,1267, %U A217079 1377,1461,1472,1473,1530,1562,1634,1682,1705,1783,1848,1852,1885,1900,1943,1957 %N A217079 Numbers n such that (n^47-1)/(n-1) is prime. %H A217079 Vincenzo Librandi, <a href="/A217079/b217079.txt">Table of n, a(n) for n = 1..1000</a> %t A217079 Select[Range[2, 2000], PrimeQ[(#^47 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217079 (Magma) [n: n in [2..2000] |IsPrime((n^47 - 1) div (n - 1))]; // _Vincenzo Librandi_, Sep 28 2012 %o A217079 (PARI) is(n)=isprime((n^47-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217079 Cf. A002384, A049409, A100330, A162862, A217070-A217089. %K A217079 nonn,easy %O A217079 1,1 %A A217079 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217079 More terms from _T. D. Noe_, Sep 26 2012