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 A004688 #31 Sep 08 2022 08:44:33
%S A004688 0,1,1,2,3,10,13,23,41,114,210,324,1034,1413,3002,4420,12422,22342,
%T A004688 40314,113211,204030,322241,1031321,1404112,2440433,4400100,12341033,
%U A004688 22241133,40132221,112423404,203111130
%N A004688 Fibonacci numbers written in base 5.
%C A004688 Sequence of last digit has period length of A001175(5)=20. Digits are almost evenly distributed. - _Carmine Suriano_, Mar 30 2012
%H A004688 Carmine Suriano and Vincenzo Librandi, <a href="/A004688/b004688.txt">Table of n, a(n) for n = 0..1000</a> (Carmine Suriano for n = 0..73)
%p A004688 read("transforms") :
%p A004688 A004688 := proc(n)
%p A004688 convert( combinat[fibonacci](n),base,5) ;
%p A004688 ListTools[Reverse](%) ;
%p A004688 digcatL(%) ;
%p A004688 end proc: # _R. J. Mathar_, Apr 01 2012
%t A004688 Table[BaseForm[Fibonacci[n],5],{n,1,20,1}] (* _Vladimir Joseph Stephan Orlovsky_, Jul 23 2008 *)
%t A004688 FromDigits[IntegerDigits[#, 5]]& / @Fibonacci[Range[0, 50]] (* _Vincenzo Librandi_, Jun 07 2013 *)
%o A004688 (PARI) vector(50, n, n--; fromdigits(digits(fibonacci(n), 5))) \\ _G. C. Greubel_, Oct 09 2018
%o A004688 (Magma) [Seqint(Intseq(Fibonacci(n),5)): n in [0..50]]; // _G. C. Greubel_, Oct 09 2018
%Y A004688 Cf. A000045 (Fibonacci), A007091 (numbers in base 5).
%K A004688 nonn,base,easy
%O A004688 0,4
%A A004688 _N. J. A. Sloane_