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 A230635 #19 Oct 31 2013 11:03:25 %S A230635 16385,16387,16402,16404,32770,32772,32787,32789,49155,49157,49172, %T A230635 49174,65542,65554,81922,81924,81939,81941,98307,98309,98324,98326, %U A230635 114692,114694,114709,114711,131079,131091,147459,147461,147476,147478,163844,163846,163861 %N A230635 Numbers n such that m + (sum of digits in base-4 representation of m) = n has exactly three solutions. %H A230635 Donovan Johnson, <a href="/A230635/b230635.txt">Table of n, a(n) for n = 1..10000</a> %H A230635 <a href="/index/Coi#Colombian">Index entries for Colombian or self numbers and related sequences</a> %Y A230635 Related base-4 sequences: A053737, A230631, A230632, A010064, A230633, A230634, A230635, A230636, A230637, A230638, A010065 (trajectory of 1) %K A230635 nonn,base %O A230635 1,1 %A A230635 _N. J. A. Sloane_, Oct 30 2013