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 A049522 #43 Feb 16 2025 08:32:40 %S A049522 1,25,154,763,763,763,710101,22931746,24658602,386980413,15647738229, %T A049522 368299898267,2164164669333,5758910552710,28642224609577, %U A049522 28642224609577,28642224609577 %N A049522 Smallest starting index for a run of at least n consecutive equal digits in decimal expansion of Pi. %C A049522 Digits 3,1,4,1,5,... are indexed 1,2,3,4,5,... %C A049522 a(11) > 2*10^9. - _M. F. Hasler_, Mar 21 2017 %C A049522 a(12) > 99*10^9. - _Giovanni Resta_, Oct 02 2019 %C A049522 a(15) > 12*10^12. - _Dmitry Petukhov_, Dec 30 2019 %C A049522 a(18) > 50*10^12. - _Dmitry Petukhov_, Oct 30 2021 %H A049522 <a href="http://www.subidiom.com/pi/">Pi search engine</a> (searches initial 2 x 10^9 digits of Pi) %H A049522 Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a> (searches initial 2 x 10^8 digits of Pi) %H A049522 Yasumasa Kanada, <a href="http://www.super-computing.org/pi-decimal_current.html">Statistical Distribution Information</a>, Home page, Computer Centre, The University of Tokyo. %H A049522 Timothy Mullican, <a href="https://storage.googleapis.com/pi50t/index.html">50 trillion digits of pi</a> %H A049522 PI-world Site, <a href="https://web.archive.org/web/20140130074648/http://piworld.calico.jp/epidigits.html">The digits and Statistics for 12 trillion digits of PI</a> [archived page] %H A049522 Peter Trüb, <a href="https://pi2e.ch/blog/2017/03/10/pi-digits-download/">22.4 trillion digits of pi</a> %H A049522 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a> %Y A049522 Cf. A049514-A049523. %Y A049522 Compare A049523: the first run of six 9's occurs (with starting index 763) before any runs of exactly four or exactly five equal digits. %Y A049522 Cf. A084145 (digit with this starting index). %K A049522 nonn,base,more %O A049522 1,2 %A A049522 _Harvey P. Dale_ %E A049522 More terms from _Rick L. Shepherd_, May 22 2003 %E A049522 a(10) from _Felix Fröhlich_, Oct 06 2016 %E A049522 a(11) from _Giovanni Resta_, Oct 02 2019 %E A049522 a(12)-a(14) added by _Dmitry Petukhov_, Dec 30 2019 %E A049522 a(15)-a(17) from _Dmitry Petukhov_, Oct 30 2021 %E A049522 a(15)-a(17) had off-by-1 error, corrected by _Mike Keith_, Feb 03 2025