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 A177093 #30 Sep 08 2022 08:45:53 %S A177093 2,4,7,10,11,31,127,136,215,953,1139,1799,3406,7633,13090,13171,13511, %T A177093 32593 %N A177093 Numbers n such that 9^n-8 is prime. %C A177093 a(19) > 2*10^5. - _Robert Price_, Jul 29 2015 %p A177093 A177093:=n->`if`(isprime(9^n-8), n, NULL): seq(A177093(n), n=1..10^3); # _Wesley Ivan Hurt_, Nov 14 2014 %t A177093 Select[Range[1000], PrimeQ[9^#-8] &] (* _Vincenzo Librandi_, Nov 15 2014 *) %o A177093 (Magma) [n: n in [1..900]| IsPrime(9^n-8)] %o A177093 (PARI) is(n)=isprime(9^n-8) \\ _Charles R Greathouse IV_, Nov 15 2014 %Y A177093 Cf. A177094. %K A177093 nonn,more %O A177093 1,1 %A A177093 _Vincenzo Librandi_, Nov 15 2010 %E A177093 Extended and crossref added by _D. S. McNeil_, Nov 15 2010 %E A177093 a(14)-a(18) from _Robert Price_, Jul 29 2015