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 A217082 #15 Sep 08 2022 08:46:04 %S A217082 2,19,69,88,138,155,205,234,336,420,425,455,470,525,555,561,608,626, %T A217082 667,674,766,779,846,851,937,971,998,1053,1055,1112,1137,1263,1329, %U A217082 1383,1445,1448,1499,1544,1551,1578,1640,1689,1724,1750,1793,1868,2143,2241,2358 %N A217082 Numbers n such that (n^61-1)/(n-1) is prime. %H A217082 Vincenzo Librandi, <a href="/A217082/b217082.txt">Table of n, a(n) for n = 1..1000</a> %t A217082 Select[Range[2, 2400], PrimeQ[(#^61 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217082 (Magma) [n: n in [2..2400] |IsPrime((n^61 - 1) div (n - 1))]; // _Vincenzo Librandi_, Sep 28 2012 %o A217082 (PARI) is(n)=isprime((n^61-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217082 Cf. A002384, A049409, A100330, A162862, A217070-A217089. %K A217082 nonn,easy %O A217082 1,1 %A A217082 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217082 More terms from _T. D. Noe_, Sep 26 2012