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 A139394 #10 Jan 20 2024 18:01:45 %S A139394 0,0,0,1,1,0,2,2,2,1,2,2,1,3,4,3,3,2,2,3,3,3,4,0,1,5,4,4,7,7,8,7,6,8, %T A139394 4,4,6,4,5,5,3,4,3,6,6,9,10,9,11,11,13,8,8,8,7,8,10,9,8,10,12,12,10, %U A139394 11,9,8,7,8,8,5,7,6,8,7,8,9,9,13,13,11,11,12,13,11,12,13,9,11,10,11,10,6,9 %N A139394 a(n) = A024899(n)-A024898(n). %C A139394 From _Zak Seidov_, Nov 12 2008: (Start) %C A139394 Conjecture: a(n) > 0, except n=1,2,3,6,24, when a(n)=0. %C A139394 This fact can be apparently explained by existence of twin primes. (End) %H A139394 Zak Seidov, <a href="/A139394/b139394.txt">Table of n, a(n) for n = 1..3000.</a> %H A139394 Zak Seidov, <a href="http://zak08.livejournal.com/2507.html">A024899(n) > A024898(n)</a> [From _Zak Seidov_, Nov 12 2008] %Y A139394 Cf. A024898, A024899. %K A139394 nonn,look %O A139394 1,7 %A A139394 _Zak Seidov_, Apr 18 2008