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 A251259 #20 Sep 08 2022 08:46:10 %S A251259 3,4,35,119,476,507,6471,13319,31799 %N A251259 Numbers n such that 11*12^n + 1 is prime. %C A251259 a(10) > 2*10^5. - _Robert Price_, Mar 20 2015 %e A251259 11*12^4 + 1 = 228097, which is prime. %t A251259 Select[Range[0, 1000], PrimeQ[11*12^# + 1] &] %o A251259 (Magma) [n: n in [1..600]| IsPrime(11*12^n+1)]; // _Vincenzo Librandi_, Mar 21 2015 %o A251259 (PARI) is(n)=ispseudoprime(11*12^n+1) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A251259 Cf. A079907. %K A251259 nonn,more %O A251259 1,1 %A A251259 _Robert Price_, Mar 20 2015