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 A303595 #9 May 28 2018 23:11:17 %S A303595 1,2,3,4,5,6,8,9,10,7,11,13,14,15,12,18,16,17,21,20,22,23,42,43,25,19, %T A303595 24,26,27,44,28,31,32,33,38,30,37,34,35,36,40,39,29,46,47,48,41,49,51, %U A303595 52,53,50,45,54,59,58,60,57,61,62,56,66,64,65,63,67,71,69,70,68,74,73 %N A303595 Index of n-th prime in A294994, or -1 if that prime is missing. %C A303595 Conjectured to be a permutation of the natural numbers. %H A303595 N. J. A. Sloane, <a href="/A303595/b303595.txt">Table of n, a(n) for n = 1..5000</a> %Y A303595 Cf. A294994. %K A303595 nonn %O A303595 1,2 %A A303595 _N. J. A. Sloane_, May 28 2018