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 A029951 #27 Jul 07 2025 04:04:39 %S A029951 0,2,4,6,8,22,44,66,88,202,212,222,232,242,252,262,272,282,292,404, %T A029951 414,424,434,444,454,464,474,484,494,606,616,626,636,646,656,666,676, %U A029951 686,696,808,818,828,838,848,858,868,878,888,898,2002,2112,2222 %N A029951 Even palindromes. %H A029951 John Cerkan, <a href="/A029951/b029951.txt">Table of n, a(n) for n = 1..10000</a> %H A029951 Patrick De Geest, <a href="https://www.worldofnumbers.com/index.html">World!Of Numbers</a> %t A029951 palindromicQ[n_, b_:10] := TrueQ[IntegerDigits[n, b] == Reverse[IntegerDigits[n, b]]]; Select[Range[2, 10^4, 2], palindromicQ[#] &] (* _Alonso del Arte_, Feb 23 2012 *) %t A029951 Select[Range[0, 2222, 2], PalindromeQ] (* _Michael De Vlieger_, May 12 2017, Version 10.3 *) %Y A029951 Cf. A002113 (superset), A062287 (subset), A367807 (halved). %Y A029951 Cf. A045638, A045639, A043040, A045641, A045642, A045643, A045644, A083852. %K A029951 nonn,base %O A029951 1,2 %A A029951 _Patrick De Geest_