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Scan decimal expansion of e until all n-digit strings have been seen; a(n) is number of digits that must be scanned.
1

%I #35 Jan 10 2023 11:38:56

%S 21,372,8092,102128,1061613,12108841,198150341,1929504534

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

%C The digits scanned are {2, 7, 1, 8, 2, 8, ...}, so the initial 2 in 2.71828... is included and counted as the first digit.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConstantDigitScanning.html">Constant Digit Scanning</a>

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

%Y Cf. A001113 (decimal expansion of e).

%Y Cf. A036900 (last number encountered when scanning the decimal expansion of e for all n-digit strings).

%Y Cf. A088576 (starting positions of the first occurrence of n in the decimal expansion of e).

%Y Cf. A032510, A036900-A036906.

%K nonn,base,more

%O 1,1

%A _Michael Kleber_

%E a(7) from _Piotr Idzik_, Nov 01 2011

%E a(8) from _Eric W. Weisstein_, Sep 11 2013