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 A241686 #16 May 10 2014 10:00:39
%S A241686 1,2,3,3,3,5,3,5,7,7,5,11,7,11,13,13,11,17,7,17,19,13,17,19,19,23,23,
%T A241686 19,17,29,19,23,29,31,29,31,31,29,37,37,29,41,19,41,43,31,41,43,37,47,
%U A241686 43,43,47,47,43,53,53,43,47,59,43,53,59,61,59,61,61,53
%N A241686 a(1)=1, a(2)=2, a(3)=3; for n>=4, a(n) = n - A082467(n).
%C A241686 a(i)=i, i=1,2,3, since A082467 is natural extended as 0 for n=1,2,3. For n>=2, a(n) and 2*n-a(n) are both primes. Sequence {2*n - a(n)} begins 1,2,3,5,7,7,11,11,11,13,17,13,19,17,17,19,23,19,31,...
%H A241686 Peter J. C. Moses, <a href="/A241686/b241686.txt">Table of n, a(n) for n = 1..1000</a>
%Y A241686 Cf. A082467.
%K A241686 nonn
%O A241686 1,2
%A A241686 _Vladimir Shevelev_, Apr 27 2014
%E A241686 More terms from _Peter J. C. Moses_