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 A135140 #8 Sep 28 2016 15:11:58 %S A135140 0,1,2,3,4,5,6,7,8,9,13,14,16,17,18,19,23,24,25,26,27,28,29,31,32,36, %T A135140 37,39,41,42,43,45,48,49,51,52,53,54,56,57,59,61,63,64,68,69,71,72,73, %U A135140 74,75,78,79,81,82,84,86,87,89,91,92,93,95,96,97,98,101,102,103,104,121 %N A135140 Numbers n such that n and n^2 do not contain successive identical digits. %H A135140 G. C. Greubel, <a href="/A135140/b135140.txt">Table of n, a(n) for n = 1..1000</a> %t A135140 Select[Range[0,150],Count[Differences[IntegerDigits[#]],0] == Count[ Differences[IntegerDigits[#^2]],0]==0&] (* _Harvey P. Dale_, Mar 14 2012 *) %Y A135140 A subset of A050741. %K A135140 base,nonn %O A135140 1,3 %A A135140 _Zak Seidov_, Feb 13 2008