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 A025010 #8 May 09 2018 23:00:20 %S A025010 5,10,18,28,42,60,84,115,152,198,253,320,399,494,605,736,891,1072, %T A025010 1280,1521,1800,2120,2488,2910,3387,3934,4552,5250,6038,6929,7931, %U A025010 9057,10324,11733,13315,15076,17043,19224,21656,24361,27353,30660,34330,38382,42866 %N A025010 a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 4. %H A025010 Chai Wah Wu, <a href="/A025010/b025010.txt">Table of n, a(n) for n = 1..901</a> %t A025010 g[ n_Integer ] := (k = n + PrimePi[ n ] + 1; While[ k - PrimePi[ k ] - 1, k++ ]; k); NestList[ g, 5, 45 ] %Y A025010 Cf. A006508, A022450, A022451, A025011. %K A025010 nonn %O A025010 1,1 %A A025010 _David W. Wilson_