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Scan decimal expansion of Pi until all n-digit strings have been seen; a(n) is number of digits that must be scanned.
3

%I #21 Feb 16 2025 08:32:37

%S 32,606,8555,99849,1369564,14118312,166100506,1816743912,22445207406,

%T 241641121048,2512258603207

%N Scan decimal expansion of Pi until all n-digit strings have been seen; a(n) is number of digits that must be scanned.

%H Fabrice Bellard, <a href="http://bellard.org/pi/pi2700e9/pidigits.html">Link to data from Bellard's calculation of 2.7 trillion digits of pi</a>

%H Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PiDigits.html">Pi Digits</a>

%F a(n) = A080597(n) - 1.

%Y Cf. A000796 (decimal expansion of Pi).

%Y Cf. A080597 (= a(n) + 1).

%Y Cf. A032445 (starting positions of the first occurrences of n the decimal expansion of Pi).

%Y Cf. A032510 (last n-digit number seen when scanning for all n-digit numbers).

%Y Cf. A036900-A036906.

%K nonn,base,changed

%O 1,1

%A _Michael Kleber_

%E a(8)-a(11) from fabrice(AT)bellard.org (Fabrice Bellard), Oct 23 2011