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A065744
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Number of 9's in decimal expansion of 2^n.
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10
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 3, 3, 2, 1, 1, 1, 2, 1, 2, 2, 1, 2, 1, 0, 0, 0, 1, 3, 3, 2, 3, 5, 3, 3, 3, 0, 0, 0, 2, 3, 1, 1, 1, 2, 2, 3, 3, 2, 1, 0, 2, 5, 2, 3, 2, 0, 2, 2, 3, 3, 1, 4, 3, 2, 1, 2, 2, 4, 4, 2, 6, 8, 3, 3, 3, 1, 1, 0, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,33
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COMMENTS
| 2^12=4096 so a(12)=1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=0,...,1000
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MATHEMATICA
| Table[ Count[ IntegerDigits[2^n], 9], {n, 0, 100} ]
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PROG
| (PARI) Count(x, d)= { local(c=0, f); while (x>9, f=x-10*(x\10); if (f==d, c++); x\=10); if (x==d, c++); return(c) } { for (n=0, 1000, a=Count(2^n, 9); write("b065744.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 27 2009]
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CROSSREFS
| Cf. 0's A027870, 1's A065712, 2's A065710, 3's A065714, 4's A065715, 5's A065716, 6's A065717, 7's A065718, 8's A065719.
Sequence in context: A097278 A056223 A100013 * A016455 A060574 A075522
Adjacent sequences: A065741 A065742 A065743 * A065745 A065746 A065747
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KEYWORD
| nonn,base
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 04 2001
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 07 2001
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