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 A217078 #15 Sep 08 2022 08:46:04 %S A217078 15,21,26,86,89,114,123,163,180,310,332,377,409,438,448,457,477,526, %T A217078 534,556,586,612,653,665,690,692,709,760,783,803,821,848,877,899,909, %U A217078 942,981,1041,1042,1043,1066,1068,1069,1106,1126,1139,1197,1310,1386,1476,1561 %N A217078 Numbers n such that (n^43-1)/(n-1) is prime. %H A217078 Vincenzo Librandi, <a href="/A217078/b217078.txt">Table of n, a(n) for n = 1..1000</a> %t A217078 Select[Range[2, 1600], PrimeQ[(#^43 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217078 (Magma) [n: n in [2..1600] |IsPrime((n^43 - 1) div (n - 1))]; // _Vincenzo Librandi_, Sep 28 2012 %o A217078 (PARI) is(n)=isprime((n^43-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217078 Cf. A002384, A049409, A100330, A162862, A217070-A217089. %K A217078 nonn,easy %O A217078 1,1 %A A217078 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217078 More terms from _T. D. Noe_, Sep 26 2012