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 A247885 #12 Sep 29 2014 12:20:14 %S A247885 225,25,4225,9,625,4,225,1,3025,5625,9025,1,225,4,625,9,64,49,36,25, %T A247885 16,5625,87025,8850625,889914313729282379150390625,9669767640625,225, %U A247885 9,16,25,36,4,64,81,15625,1,1456358697509765625,142604475904693603515625,1050625 %N A247885 Smallest square that remains a square when prefixed with n. %H A247885 Hiroaki Yamanouchi, <a href="/A247885/b247885.txt">Table of n, a(n) for n = 1..10000</a> %o A247885 (PARI) %o A247885 a(n)=k=1;while(!issquare(eval(concat(Str(n),Str(k^2)))),k++);k^2 %o A247885 vector(24,n,a(n)) %Y A247885 Cf. A167035, A167036, A167037, A167038, A167039, A167041, A167042, A167043, A167044. %K A247885 nonn,base,look %O A247885 1,1 %A A247885 _Derek Orr_, Sep 25 2014 %E A247885 a(25)-a(39) from _Hiroaki Yamanouchi_, Sep 26 2014