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 A217088 #14 Feb 17 2017 15:35:31 %S A217088 2,114,159,190,234,251,436,616,834,878,1008,1049,1060,1062,1118,1472, %T A217088 1689,1792,2282,2334,2463,2494,2584,2672,2706,2739,2747,2872,3145, %U A217088 3210,3312,3427,3429,3442,3652,3855,4000,4074,4104,4287,4419,4493,4635,4675,4708,4839 %N A217088 Numbers n such that (n^89-1)/(n-1) is prime. %H A217088 Vincenzo Librandi, <a href="/A217088/b217088.txt">Table of n, a(n) for n = 1..300</a> %t A217088 Select[Range[2, 1000], PrimeQ[(#^89 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217088 (PARI) is(n)=isprime((n^89-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217088 Cf. A002384, A049409, A100330, A162862, A217070-A217089. %K A217088 nonn %O A217088 1,1 %A A217088 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217088 More terms from _T. D. Noe_, Sep 26 2012