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 A216569 #25 Sep 18 2019 17:36:33
%S A216569 23,47,359,431,433,9311,25561,35999,37511,50833,81839,590041,593689,
%T A216569 1285607,1636007,1968721
%N A216569 Numbers n such that the n-th Fibonacci number is prime and can be written in the form a^2 + 6*b^2.
%H A216569 Blair Kelly, <a href="http://mersennus.net/fibonacci">Factorizations of Fibonacci and Lucas numbers</a>
%t A216569 Select[Range[2*10^6],PrimeQ[Fibonacci[#]]&&FindInstance[a^2+6b^2==Fibonacci[#],{a,b},Integers]!={}&] (* _Harvey P. Dale_, Sep 18 2019 *)
%Y A216569 Cf. A000045, A001605.
%Y A216569 Intersection of A005478 and A155716.
%K A216569 nonn
%O A216569 1,1
%A A216569 _V. Raman_, Sep 08 2012