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Number of decimal digits in Fermat(10^n).
0

%I #15 Aug 15 2015 10:07:14

%S 1,309,381600854690147056244358827361

%N Number of decimal digits in Fermat(10^n).

%C Next term a(3) has 301 digits.

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

%t Block[{$MaxExtraPrecision = Infinity}, Table[1 + Floor[2^10^n Log[10, 2]], {n, 0, 2}]]

%Y Subsequence of A057755. - _Arkadiusz Wesolowski_, Jun 30 2011

%Y Cf. A000021.

%K nonn,base,bref

%O 0,2

%A _Eric W. Weisstein_, Nov 30 2005