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 A217089 #13 Feb 17 2017 11:58:57 %S A217089 12,90,104,234,271,339,420,421,428,429,464,805,909,934,1054,1114,1116, %T A217089 1128,1144,1159,1193,1364,1788,2086,2215,2254,2448,2461,2593,2595, %U A217089 2771,2787,2829,2859,2952,3029,3075,3144,3250,3265,3268,3301,3701,3752,3875,4026 %N A217089 Numbers n such that (n^97-1)/(n-1) is prime. %H A217089 Vincenzo Librandi, <a href="/A217089/b217089.txt">Table of n, a(n) for n = 1..300</a> %t A217089 Select[Range[2, 1000], PrimeQ[(#^97 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217089 (PARI) is(n)=isprime((n^97-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217089 Cf. A002384, A049409, A100330, A162862, A217070-A217088. %K A217089 nonn %O A217089 1,1 %A A217089 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217089 More terms from _T. D. Noe_, Sep 26 2012