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 A043675 #18 Aug 29 2025 16:19:50
%S A043675 16,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,35,36,37,38,39,40,
%T A043675 41,42,43,44,45,46,47,48,49,50,52,53,54,55,56,57,58,59,60,61,62,63,64,
%U A043675 65,66,67,69,70,71,72,73,74,75,76,77,78,79
%N A043675 Numbers whose base-16 representation has exactly 2 runs.
%H A043675 Robert Israel, <a href="/A043675/b043675.txt">Table of n, a(n) for n = 1..10000</a>
%p A043675 N:= 3; # get all results <= 16^N
%p A043675 sort([seq(seq(seq(seq((a*(16^n-16^k)+b*(16^k-1))/15, k=1..n-1),n=2..N),
%p A043675 b={$0..15} minus {a}),a=1..15)]); # _Robert Israel_, Dec 11 2015
%Y A043675 Subsequence of A043705.
%K A043675 nonn,base,changed
%O A043675 1,1
%A A043675 _Clark Kimberling_