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 A083644 #15 Feb 16 2025 08:32:49
%S A083644 762,763,19446,56988,161862,193034,193035,220568,456189,626757,
%T A083644 1104484,1143176,1200370,1240405,1437382,1500808,1532245,1593224,
%U A083644 1623041,1681741,1722776,1722777,1722778,1985813,1985814,2280176,2474024
%N A083644 Starting positions of strings of five 9's in the decimal expansion of Pi.
%H A083644 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>
%H A083644 Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>
%H A083644 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>
%t A083644 Module[{nn=25*10^5,pid},pid=RealDigits[Pi,10,nn][[1]];SequencePosition[pid,{9,9,9,9,9}]][[;;,1]]-1 (* _Harvey P. Dale_, Dec 02 2024 *)
%Y A083644 Cf. A083643 (four 9's), A083645 (six 9's).
%K A083644 base,nonn
%O A083644 1,1
%A A083644 _Rick L. Shepherd_, May 06 2003