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 A083626 #17 Feb 16 2025 08:32:49
%S A083626 21880,29868,32427,43523,48439,48440,59983,64870,74392,100537,102387,
%T A083626 102388,124494,131591,140744,140745,141919,147343,151265,161077,
%U A083626 162317,166974,180722,194824,200045,226102,250129,250130,252499,252500,252501
%N A083626 Starting positions of strings of four 6's in the decimal expansion of Pi.
%H A083626 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>
%H A083626 Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>
%H A083626 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>
%t A083626 Transpose[StringPosition[StringDrop[ToString[N[Pi,9! ]],2],"6666"]][[1]] (* _Vladimir Joseph Stephan Orlovsky_, Jun 19 2009 *)
%t A083626 Flatten[Position[Partition[RealDigits[Pi,10,260000][[1]],4,1], {6,6,6,6}]]-1 (* _Harvey P. Dale_, Apr 27 2012 *)
%Y A083626 Cf. A083625 (three 6's), A083627 (five 6's).
%K A083626 base,nonn
%O A083626 1,1
%A A083626 _Rick L. Shepherd_, May 03 2003