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 A247312 #7 Sep 14 2014 00:22:46 %S A247312 11252109375,47450841796875,187605480615234375,712096246922607421875, %T A247312 2627953955633148193359375,9500846300153588104248046875, %U A247312 29357159521824837441192448139190673828125,80932484400013426603726400434970855712890625,218326368611836548856645001359283924102783203125 %N A247312 Positive numbers not divisible by 10 whose squares remain squares when prefixed with 100. %C A247312 Square roots of A247262. %H A247312 Chai Wah Wu, <a href="/A247312/b247312.txt">Table of n, a(n) for n = 1..168</a> %e A247312 11252109375^2 = 126609965386962890625 and 100126609965386962890625 is square. %Y A247312 Cf. A247261, A247262, A247263, A247264. %K A247312 nonn %O A247312 1,1 %A A247312 _Chai Wah Wu_, Sep 13 2014