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 A218043 #18 Feb 16 2025 08:33:18 %S A218043 12,21,102,111,120,201,210,1002,1011,1020,1101,1110,1200,2001,2010, %T A218043 2100,10002,10011,10020,10101,10110,10200,11001,11010,11100,12000, %U A218043 20001,20010,20100,21000,100002,100011,100020,100101,100110,100200,101001,101010,101100 %N A218043 Base 3 numbers that have digits that sum to 3. %C A218043 It is a representation of the "energy states" of "multiplex pair" notation of 3 quantum of objects in a juggling pattern. %C A218043 0 = an empty site, or empty hand. 1 = one object resides in the site. 2 = two objects reside in the site. %H A218043 Eric W. Weisstein, <a href="https://mathworld.wolfram.com/Siteswap.html">Mathworld: Siteswap</a> %t A218043 t = Select[Range[500], Total[IntegerDigits[#, 3]] == 3 &]; FromDigits /@ IntegerDigits[t, 3] (* _T. D. Noe_, Oct 19 2012 *) %K A218043 nonn,base %O A218043 1,1 %A A218043 _Joshua S.M. Weiner_, Oct 19 2012