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 A138116 #14 Jun 05 2025 13:55:58
%S A138116 1,1,6,1,6,1,1,6,1,8,1,6,1,8,0,1,6,1,8,0,3,1,6,1,8,0,3,3,1,6,1,8,0,3,
%T A138116 3,9,1,6,1,8,0,3,3,9,8,1,6,1,8,0,3,3,9,8,8,1,6,1,8,0,3,3,9,8,8,7,1,6,
%U A138116 1,8,0,3,3,9,8,8,7,4
%N A138116 Triangle read by rows: row n lists the first n digits of the decimal expansion of golden ratio phi.
%C A138116 Also, successive digits of A011551.
%e A138116 Triangle begins:
%e A138116 1
%e A138116 1,6
%e A138116 1,6,1
%e A138116 1,6,1,8
%e A138116 1,6,1,8,0
%t A138116 s={};Do[AppendTo[s,RealDigits[GoldenRatio,10,n][[1]]],{n,12}];s//Flatten (* _James C. McMahon_, Jun 05 2025 *)
%Y A138116 Cf. A001622 (phi), A011551, A138072, A138073, A175834 (polynomial roots).
%K A138116 easy,nonn,tabl,base
%O A138116 1,3
%A A138116 _Omar E. Pol_, Mar 14 2008