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 A023747 #13 Apr 02 2014 06:13:06 %S A023747 0,1,2,3,4,6,7,8,9,12,13,14,18,19,24,31,32,33,34,37,38,39,43,44,49,62, %T A023747 63,64,68,69,74,93,94,99,124,156,157,158,159,162,163,164,168,169,174, %U A023747 187,188,189,193,194,199,218,219,224,249,312,313,314,318,319 %N A023747 Plaindromes: numbers whose digits in base 5 are in nondecreasing order. %H A023747 Vincenzo Librandi, <a href="/A023747/b023747.txt">Table of n, a(n) for n = 1..1000</a> %t A023747 Select[Range[0,319],LessEqual@@IntegerDigits[#,5]&] (* _Ray Chandler_, Jan 06 2014 *) %K A023747 nonn,base,easy %O A023747 1,3 %A A023747 _Olivier Gérard_ %E A023747 Change offset to 1 by _Ray Chandler_, Jan 06 2014