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 A023761 #16 Jan 06 2014 15:13:38 %S A023761 0,1,2,3,4,5,6,10,11,12,15,16,17,18,20,21,22,23,24,25,30,31,50,55,56, %T A023761 60,61,62,75,80,81,85,86,87,90,91,92,93,100,105,106,110,111,112,115, %U A023761 116,117,118,120,121,122,123,124,125,150,155,156,250,275,280,281 %N A023761 Nialpdromes: digits in base 5 are in nonincreasing order. %H A023761 Vincenzo Librandi, <a href="/A023761/b023761.txt">Table of n, a(n) for n = 1..1001</a> (adapted to the new offset from _Bruno Berselli_) %t A023761 Select[Range[0, 4000], Max[Differences[IntegerDigits[#, 5]]]<=0&] (* _Vincenzo Librandi_, Dec 26 2012 *) %t A023761 Select[Range[0,281],GreaterEqual@@IntegerDigits[#,5]&] (* _Ray Chandler_, Jan 06 2014 *) %K A023761 nonn,base,easy %O A023761 1,3 %A A023761 _Olivier Gérard_