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 A156913 #6 Oct 15 2013 05:14:40 %S A156913 2,4,6,11,14,21,37,75,81,176,194,310,324,332,345,399,447,612,1122, %T A156913 1209,1614,1874,1921,2186,2329,2482,2509,2874,2940,2975,3230,3611, %U A156913 4185,4650,4923,5172,5248,5543,5587,5673,5714,5764,6038,6078,6250,6430,6976,7023 %N A156913 Numbers n with property that A100486(n) is square. %C A156913 For n<2*10^6 there are 411 such numbers. %F A156913 pi(n) + n-th prime = square. %e A156913 n=2 pi(2)+p(2)=2+2=4, n=4 pi(4)+p(4)=2+7=9, n=6 pi(6)+p(6)=3+13=16, etc. %o A156913 (PARI) isok(n) = issquare(primepi(n) + prime(n)); \\ _Michel Marcus_, Oct 15 2013 %Y A156913 Cf. A100486. %K A156913 nonn %O A156913 1,1 %A A156913 _Zak Seidov_, Feb 18 2009