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 A033597 #10 Jul 08 2025 19:53:58
%S A033597 4,5,6,8,9,9,9,10,12,14,15,15,15,16,18,20,21,21,21,24,26,26,26,26,26,
%T A033597 27,30,33,34,34,34,34,34,36,39,39,39,40,42,44,45,45,45,48,50,50,50,50,
%U A033597 50,53,56,56,56,56,56,57,60
%N A033597 (nextprime(n)+prevprime(n))/2.
%F A033597 2*a(n) = A151800(n) + A151799(n). - _R. J. Mathar_, Feb 06 2017
%t A033597 Table[(NextPrime[n]+NextPrime[n,-1])/2,{n,4,60}] (* _Harvey P. Dale_, Aug 29 2022 *)
%K A033597 nonn
%O A033597 4,1
%A A033597 _N. J. A. Sloane_