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 A217085 #19 May 17 2018 21:34:39 %S A217085 11,15,75,114,195,215,295,335,378,559,566,650,660,832,871,904,966, %T A217085 1021,1112,1203,1334,1433,1485,1724,1822,1959,1998,2115,2154,2432, %U A217085 2465,2486,2544,2559,2564,2575,2611,2681,2705,2735,2754,2806,2880,3158,3222,3306,3368 %N A217085 Numbers n such that (n^73-1)/(n-1) is prime. %H A217085 G. C. Greubel, <a href="/A217085/b217085.txt">Table of n, a(n) for n = 1..5000</a> (terms 1..500 from Vincenzo Librandi) %t A217085 Select[Range[2, 1000], PrimeQ[(#^73 - 1)/(# - 1)] &] (* _T. D. Noe_, Sep 26 2012 *) %o A217085 (PARI) is(n)=isprime((n^73-1)/(n-1)) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A217085 Cf. A002384, A049409, A100330, A162862, A217070-A217089. %K A217085 nonn %O A217085 1,1 %A A217085 _Tim Johannes Ohrtmann_, Sep 26 2012 %E A217085 More terms from _T. D. Noe_, Sep 26 2012