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 A093009 #6 Mar 30 2012 18:50:43
%S A093009 3,95,15,19,95,13,15,17,19,43,95,103,27,29,31,67,35,37,39,41,43,367,
%T A093009 95,199,103,53,223,463,119,61,63,131,67,139,71,73,75,311,79,163,335,
%U A093009 5503,87,89,367,751,95,97,199,101,103,211,215,109,223,113,463,241663
%N A093009 Smallest number m such that m is prime iff n is not prime and the binary representation of m equals n with appended trailing 1's.
%C A093009 a(n) = Max{A093007(n), A038699(n)};
%C A093009 n>1: A070939(a(n))=A070939(n)+A093008(n), A000120(a(n))=A000120(n)+A093008(n).
%K A093009 nonn
%O A093009 1,1
%A A093009 _Reinhard Zumkeller_, Mar 14 2004