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 A083646 #20 Feb 16 2025 08:32:49
%S A083646 1722776,3389380,4313727,5466169,14593770,15256174,20202676,36356642,
%T A083646 36356643,39375939,54971455,66780105,66780106,78088568,123921866,
%U A083646 125564426,174904193,195530904,196790272,209136149,212168291,219228757,242798761,249686197,252761434,270520788
%N A083646 Starting positions of strings of seven 9's in the decimal expansion of Pi.
%H A083646 Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>
%H A083646 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>
%H A083646 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>
%t A083646 SequencePosition[RealDigits[Pi,10,4*10^7][[1]],{9,9,9,9,9,9,9}][[All,1]]-1 (* The program generates the first 10 terms of the sequence. *) (* _Harvey P. Dale_, Jan 22 2023 *)
%Y A083646 Cf. A083645 (six 9's).
%K A083646 nonn,base
%O A083646 1,1
%A A083646 _Rick L. Shepherd_, May 06 2003
%E A083646 More terms from _Rick L. Shepherd_, Aug 07 2006
%E A083646 More terms from _Jinyuan Wang_, Mar 01 2020