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 A244956 #18 Feb 01 2024 16:12:50
%S A244956 1,6,6,156,5,6,126,656,126,30,781,156,26,126,30,656,3281,126,3781,780,
%T A244956 126,3256,3151,97656,25,26,756,756,15631,30,31,3776,16401,3876,630,
%U A244956 756,3256,3876,156,3280,656,126,15781,3256,630,16376,3901,472656,15631,150
%N A244956 Smallest positive multiple of n whose base-5 representation contains only 0's and 1's.
%H A244956 Harvey P. Dale, <a href="/A244956/b244956.txt">Table of n, a(n) for n = 1..1000</a>
%H A244956 Ed Pegg Jr., <a href="http://www.mathpuzzle.com/Binary.html">'Binary' Puzzle</a>
%H A244956 Eric M. Schmidt, <a href="/A004290/a004290_1.sage.txt">Sage code to compute this sequence</a> (use b=5)
%H A244956 Chai Wah Wu, <a href="http://www.jstor.org/stable/10.4169/amer.math.monthly.121.06.529">Pigeonholes and repunits</a>, Amer. Math. Monthly, 121 (2014), 529-533.
%t A244956 Module[{nn=10,b5},b5=Rest[FromDigits[#,5]&/@Tuples[{0,1},nn]];Table[SelectFirst[b5,Mod[ #,n]==0&],{n,100}]] (* _Harvey P. Dale_, Feb 01 2024 *)
%Y A244956 Cf. A004285 (written in base 5), A004290, A244954-A244960.
%K A244956 nonn,base
%O A244956 1,2
%A A244956 _Eric M. Schmidt_, Jul 09 2014
%E A244956 Data corrected, offset corrected, Mathematica program replaced, and b-file replaced by _Harvey P. Dale_, Feb 01 2024