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 A036435 #14 May 18 2015 16:06:57
%S A036435 1,4,9,11,14,19,41,44,49,91,94,99,111,114,119,141,144,149,191,194,199,
%T A036435 411,414,419,441,444,449,491,494,499,911,914,919,941,944,949,991,994,
%U A036435 999,1111,1114,1119,1141,1144,1149,1191,1194,1199,1411,1414,1419,1441
%N A036435 Digits are nonzero squares.
%C A036435 Invented by the HR concept formation program.
%H A036435 Harvey P. Dale, <a href="/A036435/b036435.txt">Table of n, a(n) for n = 1..1000</a>
%H A036435 S. Colton, <a href="http://www.cs.uwaterloo.ca/journals/JIS/colton/joisol.html">Refactorable Numbers - A Machine Invention</a>, J. Integer Sequences, Vol. 2, 1999, #2.
%H A036435 S. Colton, <a href="http://web.archive.org/web/20070831060523/http://www.dai.ed.ac.uk/homes/simonco/research/hr/">HR - Automatic Theory Formation in Pure Mathematics</a>
%t A036435 Flatten[Table[FromDigits/@Tuples[{1,4,9},n],{n,4}]] (* _Harvey P. Dale_, May 18 2015 *)
%o A036435 (PARI) isok(n) = {digs = digits(n); for (i=1, #digs, if (! digs[i] || ! issquare(digs[i]), return (0));); return (1);} \\ _Michel Marcus_, Aug 31 2013
%Y A036435 Cf. A046030.
%K A036435 easy,nonn,base
%O A036435 1,2
%A A036435 Simon Colton (simonco(AT)cs.york.ac.uk)
%E A036435 More terms from Sam Alexander (pink2001x(AT)hotmail.com).