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 A133901 #3 Mar 30 2012 17:27:54 %S A133901 33,99,1119111,10110901101,11110901111,101109901101,1011109011101, %T A133901 1110109010111,10111099011101,100110090011001,100111090111001, %U A133901 101011090110101,111001090100111 %N A133901 Numbers in A128921 whose square is not a palindrome. %C A133901 Also terms of A128921 that do not consist completely of digits 0, 1, 2, however excluding A128921(4) = 3. %C A133901 Conjecture: Sequence is infinite. %e A133901 A128921(41) = 1119111, 1119111^2 = 1252409430321 is not a palindrome, but its reverse is also a square: 1230349042521 = 1109211^2. %Y A133901 Cf. A128921 (palindromes p such that reverse of p^2 is also a square), A002113 (palindromes in base 10), A057135 (palindromes whose square is a palindrome), A057136 (palindromes whose square root is a palindrome). %K A133901 nonn,base %O A133901 1,1 %A A133901 _Klaus Brockhaus_ and _Zak Seidov_, Sep 29 2007