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 A083635 #21 Feb 16 2025 08:32:49
%S A083635 3346228,3775287,14233532,24658601,24658602,24658603,35875631,
%T A083635 43694095,49894382,62186154,66572803,71028071,72197101,79443657,
%U A083635 82144203,82144204,98539214,140465346,142032741,145827935,150841049,169354584,175962557,200761136,206408340,224615219
%N A083635 Starting positions of strings of seven 7's in the decimal expansion of Pi.
%H A083635 Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>
%H A083635 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>
%H A083635 <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>
%t A083635 SequencePosition[RealDigits[Pi,10,170*10^6][[1]],{7,7,7,7,7,7,7}][[All,1]]-1 (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Apr 01 2018 *)
%Y A083635 Cf. A083634 (six 7's), A083636 (eight 7's).
%K A083635 nonn,base
%O A083635 1,1
%A A083635 _Rick L. Shepherd_, May 05 2003
%E A083635 More terms from _Rick L. Shepherd_, Aug 07 2006
%E A083635 More terms from _Jinyuan Wang_, Mar 01 2020