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 A247267 #23 Nov 04 2014 03:36:53 %S A247267 1,4,9,49,64,81,225,625,1225,2025,3025,4225,5625,7225,9025,15625, %T A247267 27225,30625,34225,42025,50625,60025,70225,75625,81225,93025,105625, %U A247267 275625,330625,600625,893025,950625,970225,1050625,2030625,3330625,4950625,9455625,9765625,15405625 %N A247267 Square numbers not divisible by 100 that remain square when their most-significant (or leftmost) digit is removed. %C A247267 Subsequence of A225885. It is easy to see that the multiples of 100 in A225885 are earlier entries of the sequence multiplied by 100, so this sequence removes this redundancy in some sense. It appears that all entries in A225885 after the first 3 entries ends in either 25 or 00, so this sequence appears to end in 25 after the first 3 entries. %H A247267 Chai Wah Wu, <a href="/A247267/b247267.txt">Table of n, a(n) for n = 1..1185</a> %o A247267 (PARI) for(n=10,10^6,if(n%100,if(issquare(n)&&issquare(n%(10^(#Str(n)-1))),print1(n,", ")))) \\ _Derek Orr_, Nov 01 2014 %Y A247267 Cf. A225885, A247885. A249587. %K A247267 nonn,base %O A247267 1,2 %A A247267 _Chai Wah Wu_, Nov 01 2014 %E A247267 Added 1, 4, 9 to sequence to match A225885 - _Chai Wah Wu_, Nov 03 2014