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 A081505 #10 Aug 22 2022 10:00:32
%S A081505 2,7,337,4338014017
%N A081505 Primes of form 4^n+3^n.
%H A081505 Bogley, William A.; Williams, <a href="https://doi.org/10.1007/s00209-016-1664-3">Gerald Efficient finite groups arising in the study of relative asphericity</a>. Math. Z. 284, No. 1-2, 507-535 (2016).
%e A081505 m=4: 4^4+3^4=256+81=337 prime.
%e A081505 Exponents for first 4 terms are {0,1,4,16}.
%t A081505 Do[s=3^w+4^w; If[IntegerQ[w/100], Print[{w}]]; If[PrimeQ[s], Print[{w, s}]], {w, 0, 3400}]
%t A081505 Do[ If[ PrimeQ[3^n+4^n], Print[3^n+4^n]], {n, 0, 10000}]
%t A081505 Select[Table[4^n+3^n,{n,0,20}],PrimeQ] (* _Harvey P. Dale_, Mar 07 2017 *)
%K A081505 nonn
%O A081505 1,1
%A A081505 _Labos Elemer_, Apr 15 2003
%E A081505 a(5)>10^10000, so the next term (if it exists) is too large to include.