A114484
Number of decimal digits in Fermat(10^n).
Original entry on oeis.org
1, 309, 381600854690147056244358827361
Offset: 0
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Block[{$MaxExtraPrecision = Infinity}, Table[1 + Floor[2^10^n Log[10, 2]], {n, 0, 2}]]
A108301
Digital sum of the Fermat number 2^(2^n) + 1.
Original entry on oeis.org
3, 5, 8, 14, 26, 59, 89, 167, 377, 734, 1376, 2741, 5624, 11120, 22166, 44222, 88262, 176180, 353042, 707648, 1419974, 2836751, 5679620, 11365592, 22723865, 45445442, 90899234, 181828850
Offset: 0
a(5)=59 because 2^(2^5) + 1 = 4294967297 and the sum of those decimal digits is 59.
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a:=proc(n) local nn, z: nn:=convert(2^(2^n)+1,base,10): z:=nops(nn): add(nn[j],j=1..z) end: seq(a(n),n=0..22); # Emeric Deutsch
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f[n_] := Plus @@ IntegerDigits[2^(2^n)] + 1; Table[ f[n], {n, 0, 27}] (* Robert G. Wilson v, Jul 02 2005 *)
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