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 A271883 #8 Apr 16 2016 11:42:58 %S A271883 2,22,58,496,2740 %N A271883 Numbers n such that 9^n-8^(n-1) is prime. %C A271883 a(6) > 10^5. %e A271883 2 is a member since 9^2 - 8^1 = 81 - 8 = 73 which is a prime number. %t A271883 Select[Range[0, 100000], PrimeQ[9^# - 8^(# - 1)] &] %o A271883 (PARI) lista(nn) = for(n=1, nn, if(ispseudoprime(9^n-8^(n-1)), print1(n, ", "))); \\ _Altug Alkan_, Apr 16 2016 %Y A271883 Cf. A093713, A082103, A093717, A093793, A096185, A093794, A093795, A096186. %K A271883 nonn,more %O A271883 1,1 %A A271883 _Robert Price_, Apr 16 2016