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 A301520 #21 Apr 22 2019 17:36:20
%S A301520 0,1,2,5,10,44,65,1424
%N A301520 Numbers k such that 4*k^k + 3 is prime.
%C A301520 Next term, if it exists, is greater than 5000. - _Vaclav Kotesovec_, Mar 25 2018
%C A301520 Next term, if it exists, is greater than 25000. - _Robert Price_, Apr 22 2019
%t A301520 Flatten[{0, Select[Range[1000], PrimeQ[4*#^# + 3] &]}] (* _Vaclav Kotesovec_, Mar 25 2018 *)
%o A301520 (PARI) for(n=0, 100, if(isprime(4*n^n+3), print1(n", ")))
%Y A301520 Cf. A110932, A160360, A301519, A301521.
%K A301520 nonn,hard,more
%O A301520 1,3
%A A301520 _Seiichi Manyama_, Mar 23 2018
%E A301520 a(8) from _Vaclav Kotesovec_, Mar 25 2018