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 A216425 #25 Sep 08 2022 08:46:03 %S A216425 12,24,72,13404,179964 %N A216425 Numbers k such that 6^k + k^6 - 1 is prime. %C A216425 a(6) > 2*10^5. - _Robert Price_, Apr 14 2014 %C A216425 a(1)-a(5) are multiples of 12. - _Robert Price_, Apr 14 2014 %t A216425 Select[Range[0, 10000], PrimeQ[6^# + #^6 - 1] &] %o A216425 (Magma) [n: n in [0..1000] | IsPrime(6^n+n^6-1)]; %o A216425 (PARI) is(n)=ispseudoprime(6^n+n^6-1) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A216425 Cf. A100357, A215434-A215446, A216375. %K A216425 nonn,hard,more %O A216425 1,1 %A A216425 _Vincenzo Librandi_, Sep 07 2012 %E A216425 a(4)-a(5) from _Robert Price_, Apr 14 2014