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 A087266 #16 Jun 09 2024 09:05:03
%S A087266 1,2,4,2,1,2,1,2,1,4,1,4,4,4,8,2,1,8,2,1,1,1,1,1,1,1,1,1,2,4,1,1,2,1,
%T A087266 1,1,4,4,2,4,4,1,1,4,2,1,1,2,2,1,8,1,4,16,1,2,4,2,4,2,1,1,8,1,4,1,1,2,
%U A087266 16,1,1,1,1,4,1,1,4,8,1,4,4,8,4,4,2,1,1,2,4,8,16,2
%N A087266 a(n) = gcd(2^n, pi(2^n)) = gcd(A000079(n), A007053(n)).
%t A087266 Table[GCD[2^n, PrimePi[2^n]], {n, 40}] (* _Michael De Vlieger_, Mar 25 2017 *)
%o A087266 (PARI) a(n) = gcd(2^n, primepi(2^n)); \\ _Michel Marcus_, Mar 26 2017
%Y A087266 Cf. A000720, A007053.
%K A087266 nonn
%O A087266 1,2
%A A087266 _Labos Elemer_, Sep 16 2003
%E A087266 a(53)-a(92) from _Amiram Eldar_, Jun 09 2024