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 A230636 #12 Oct 31 2013 13:22:49 %S A230636 16777234,33554451,50331668,83886099,100663316,117440533,150994964, %T A230636 167772181,184549398,218103829,234881046,251658263,268435476, %U A230636 268435478,285212691,301989908,318767125,352321556,369098773,385875990,419430421,436207638,452984855,486539286 %N A230636 Numbers n such that m + (sum of digits in base-4 representation of m) = n has exactly four solutions. %H A230636 Donovan Johnson, <a href="/A230636/b230636.txt">Table of n, a(n) for n = 1..10000</a> %H A230636 <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a> %Y A230636 Related base-4 sequences: A053737, A230631, A230632, A010064, A230633, A230634, A230635, A230636, A230637, A230638, A010065 (trajectory of 1) %K A230636 nonn,base %O A230636 1,1 %A A230636 _Donovan Johnson_ and _N. J. A. Sloane_, Oct 31 2013