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 A258339 #22 Jul 02 2015 11:51:32 %S A258339 5,1,2,13,3,18,4,23,25,26,30,31,6,35,36,38,7,42,8,304,47,48,9,53,54, %T A258339 56,58,60,10,63,11,453,67,69,71,73,12,76,78,79,81,82,14,86,88,89,15, %U A258339 93,94,96,682,98,16,100,102,103,105,107,17,110,112,807,115,116,119,121,19,124,125,126,20,129,21,132,133,135,137,138,22,140,141,142,146,1052,147,150 %N A258339 PrimePi(A258337(n)). %C A258339 The sequence is a permutation of the positive numbers. %H A258339 Peter J. C. Moses, <a href="/A258339/b258339.txt">Table of n, a(n) for n = 1..5000</a> %F A258339 a(n) >= PrimePi(n). %Y A258339 Cf. A000720, A258337. %K A258339 nonn,base %O A258339 1,1 %A A258339 _Vladimir Shevelev_, May 27 2015