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 A126557 #8 Mar 28 2020 04:28:48
%S A126557 174737,224327,433813,541447,787243,969667,980081,1080787,1286581,
%T A126557 1372979,1534513,1567037,1570649,1577189,1659673,1726993,1931291,
%U A126557 2242883,2282041,2415557,2460827,3162503,3711047,4090787,4450373
%N A126557 Primes in A126556.
%C A126557 Prime interprimes of third order.
%C A126557 Primes that are the arithmetic mean of two consecutive prime interprimes of second order; primes of the form (A126555(k)+A126555(k+1))/2.
%H A126557 Amiram Eldar, <a href="/A126557/b126557.txt">Table of n, a(n) for n = 1..10000</a>
%o A126557 (PARI) {m=5000000;a=0;g=0;p=2;q=3;r=5;while(r<=m,if((p+r)/2==q,if(a>0,b=(a+q)/2;if(isprime(b),if(g>0,if(isprime(h=(g+b)/2),print1(h,",")));g=b));a=q);p=q;q=r; r=nextprime(r+1))} \\ _Klaus Brockhaus_, Jan 11 2007
%Y A126557 Cf. A006562 (balanced primes), A024675 (interprimes), A126554 (interprimes of second order), A126555 (prime interprimes of second order), A126556 (interprimes of third order).
%K A126557 nonn
%O A126557 1,1
%A A126557 _Artur Jasinski_, Dec 27 2006
%E A126557 Edited and extended by _Klaus Brockhaus_, Jan 11 2007