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%I #23 Nov 14 2019 12:21:00
%S 1,4,7,10,14,17,20,24,27,30,34,37,40,44,47,50,54,57,60,64,67,70,74,77,
%T 80,84,87,90,94,97,100,103,107,110,113,117,120,123,127,130,133,137,
%U 140,143,147,150,153,157,160,163,167,170,173,177,180,183,187,190,193,196
%N Number of bits in binary expansion of 10^n.
%C Number of powers of 2 less than or equal to 10^n. - _Peter Munn_, Nov 13 2019
%F a(n) = 1 + floor(n/A007524) = 1 + floor(n/log_10(2)). - _R. J. Mathar_, Nov 12 2006
%F a(n) = 1 + A066343(n). - _R. J. Mathar_, Mar 02 2007
%F a(n) = A067497(n) for n >= 1. - _Georg Fischer_, Nov 02 2018
%e a(3)=10 because 10^3 = 1111101000_2.
%e 10^1 = 10 = 1010_2 has 4 digits.
%p A007524 := log[10](2.0) ; for n from 0 to 40 do printf("%d,", 1+floor(n/A007524)) ; od: # _R. J. Mathar_, Nov 12 2006
%p a:=n->nops(convert(10^n,base,2)): seq(a(n),n=0..70); # _Emeric Deutsch_, Mar 26 2007
%Y Cf. A000079, A011557, A066343, A067497.
%Y Row 1 of A253635.
%K base,nonn
%O 0,2
%A Andrew Caldwell (spongebobpj(AT)yahoo.com), Nov 09 2006
%E More terms from _Emeric Deutsch_, Mar 26 2007
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