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%I #43 Oct 31 2021 02:39:58
%S 1,25,154,1590,17535,763,710101,22931746,24658602,386980413,
%T 15647738229,368299898267,2164164669333,5758910552710,46970519777308
%N Smallest starting index for a run of exactly n consecutive equal digits in decimal expansion of Pi.
%C Digits 3,1,4,1,5,... are indexed 1,2,3,4,5,...
%C a(11) > 2*10^9. - _M. F. Hasler_, Mar 22 2017
%C a(12) > 99*10^9. - _Giovanni Resta_, Oct 02 2019
%C a(15) > 12*10^12. - _Dmitry Petukhov_, Dec 30 2019
%C a(16) > 50*10^12, a(17) = 28642224609576. - _Dmitry Petukhov_, Oct 30 2021
%H Dave Andersen, <a href="http://www.angio.net/pi/piquery">Pi-Search Page</a>
%H 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 Timothy Mullican, <a href="https://storage.googleapis.com/pi50t/index.html">50 trillion digits of pi</a>
%H 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 James Taylor, <a href="http://www.subidiom.com/pi/">Irrational Number Search Engine</a>
%H Peter Trüb, <a href="https://pi2e.ch/blog/2017/03/10/pi-digits-download/">22.4 trillion digits of pi</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PiDigits.html">Pi Digits.</a>
%H <a href="/index/Ph#Pi314">Index entries for sequences related to the number Pi</a>
%e See A084144 for an example.
%Y Cf. A049514, A049515, A049516, A049517, A049518, A049519, A049520, A049521, A049522.
%Y Cf. A084144 (digit with this starting index).
%K nonn,base,more
%O 1,2
%A _Harvey P. Dale_
%E More terms from _Rick L. Shepherd_, May 15 2003
%E Edited and a(10) (via Taylor's search engine) added by _M. F. Hasler_, Mar 21 2017
%E a(11) from _Giovanni Resta_, Oct 02 2019
%E a(12)-a(14) added by _Dmitry Petukhov_, Dec 30 2019
%E a(15) from _Dmitry Petukhov_, Oct 30 2021
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