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 A089142 #12 May 22 2017 11:49:44 %S A089142 0,1,2,3,4,13,88,177,184,297,304,310,562,892,1300,4047,5557,9028, %T A089142 15597,28527,56890,77485,79378 %N A089142 Numbers n such that 5^n + 6 is prime. %C A089142 a(24) > 10^5. - _Robert Price_, Feb 03 2014 %e A089142 5^13 = 1220703131 a prime number %o A089142 (PARI) is(n)=ispseudoprime(5^n+6) \\ _Charles R Greathouse IV_, May 22 2017 %K A089142 nonn %O A089142 1,3 %A A089142 Herman H. Rosenfeld (herm3(AT)pacbell.net), Dec 20 2003 %E A089142 More terms from _Ray Chandler_, Dec 24 2003 %E A089142 a(1) = 0 added by _Robert Price_, Feb 03 2014 %E A089142 a(17)-a(23) from _Robert Price_, Feb 03 2014