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 A083645 #19 Feb 16 2025 08:32:49
%S A083645 762,193034,1722776,1722777,1985813,2878443,3062881,3389380,3389381,
%T A083645 3529731,4313727,4313728,5466169,5466170,6951812,7298585,8498459,
%U A083645 11295221,12943563,13347753,14388723,14593770,14593771,14670295,15256174,15256175,15866194,16192557,16785635
%N A083645 Starting positions of strings of six 9's in the decimal expansion of Pi.
%H A083645 Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>
%H A083645 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>
%H A083645 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>
%t A083645 SequencePosition[RealDigits[Pi,10,15*10^6][[1]],{9,9,9,9,9,9}][[All,1]]-1 (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Mar 19 2017 *)
%Y A083645 Cf. A083644 (five 9's), A083646 (seven 9's).
%K A083645 nonn,base
%O A083645 1,1
%A A083645 _Rick L. Shepherd_, May 06 2003
%E A083645 More terms from _Jinyuan Wang_, Mar 01 2020