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Search: id:A027870
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| A027870 |
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Number of zeros in 2^n. |
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+0
10
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| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 2, 3, 1, 1, 1, 1, 1, 0, 1, 0, 2, 3, 2, 2, 2, 1, 1, 2, 2, 3, 2, 2, 2, 1, 1, 0, 1, 3, 3, 1, 0, 1, 1, 1, 0, 0, 2, 4, 2, 0, 2, 3, 1, 1, 0, 3, 5, 3, 3, 4, 2, 3, 4, 1, 1, 4, 5, 5, 6, 6, 7, 5, 5
(list; graph; listen)
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OFFSET
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0,43
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,1000
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EXAMPLE
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2^31 = 2147483648 so a(31) = 0 and 2^42 = 4398046511104 so a(42) = 2.
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MATHEMATICA
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Table[ Count[ IntegerDigits[2^n], 0], {n, 0, 100} ]
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PROGRAM
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(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, 0); write("b027870.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 27 2009]
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CROSSREFS
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Cf. 1's A065712, 2's A065710, 3's A065714, 4's A065715, 5's A065716, 6's A065717, 7's A065718, 8's A065719, 9's A065744.
Sequence in context: A137329 A004579 A081371 this_sequence A070077 A122587 A086195
Adjacent sequences: A027867 A027868 A027869 this_sequence A027871 A027872 A027873
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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a(99) - a(104) from Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 27 2009
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