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 A217081 #19 Sep 08 2022 08:46:04 %S A217081 19,70,102,116,126,188,209,257,294,359,451,461,468,470,638,653,710, %T A217081 762,766,781,824,901,939,964,995,1036,1047,1098,1150,1211,1234,1243, %U A217081 1256,1278,1389,1401,1422,1436,1454,1492,1523,1639,1703,1705,1826,1913,1915,1978 %N A217081 Numbers n such that (n^59-1)/(n-1) is prime. %H A217081 Vincenzo Librandi, <a href="/A217081/b217081.txt">Table of n, a(n) for n = 1..1000</a> %t A217081 Select[Range[2, 2000], PrimeQ[(#^59 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217081 (Magma) [n: n in [2..2000] |IsPrime((n^59 - 1) div (n - 1))]; // _Vincenzo Librandi_, Sep 28 2012 %o A217081 (PARI) is(n)=isprime((n^59-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217081 Cf. A002384, A049409, A100330, A162862, A217070-A217089. %K A217081 nonn,easy %O A217081 1,1 %A A217081 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217081 More terms from _T. D. Noe_, Sep 26 2012