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 A230855 #10 Nov 01 2013 14:12:41 %S A230855 28,32,56,60,84,86,110,114,138,142,166,168,192,196,220,224,244,252, %T A230855 272,276,300,304,328,330,354,358,382,386,410,412,436,440,464,468,488, %U A230855 496,516,520,544,548,572,574,598,602,626,630,654,656,680,684,708,712,730,732,734,736,738,740,758,762 %N A230855 Numbers n such that m + (sum of digits in base-3 representation of m) = n has exactly three solutions. %H A230855 Donovan Johnson, <a href="/A230855/b230855.txt">Table of n, a(n) for n = 1..10000</a> %H A230855 <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a> %Y A230855 Related base-3 sequences: A053735, A134451, A230641, A230642, A230643, A230853, A230854, A230855, A230856, A230639, A230640, A010063 (trajectory of 1) %K A230855 nonn,base %O A230855 1,1 %A A230855 _N. J. A. Sloane_, Oct 31 2013