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A036461
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Number of 1 digits in base 3 representation of 2^n.
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2
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1, 0, 2, 0, 2, 2, 2, 2, 4, 0, 4, 2, 4, 2, 6, 4, 2, 4, 6, 2, 6, 4, 6, 4, 8, 2, 10, 4, 4, 8, 6, 8, 8, 8, 8, 6, 10, 8, 10, 10, 6, 6, 12, 8, 10, 14, 8, 10, 10, 12, 16, 8, 12, 18, 10, 10, 14, 10, 14, 14, 16, 10, 16, 12, 16, 16, 14, 16, 14, 18, 20, 12, 20, 10, 22, 12, 26, 8, 20, 12, 22, 14, 16
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OFFSET
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0,3
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COMMENTS
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The number of 1's in the base 3 representation of any even(odd) number is even(odd).
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LINKS
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MAPLE
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seq(numboccur(1, convert(2^n, base, 3)), n=0..100); # Robert Israel, Apr 04 2018
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MATHEMATICA
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Table[DigitCount[2^n, 3, 1], {n, 0, 120}] (* Harvey P. Dale, Mar 14 2011 *)
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PROG
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(PARI) a(n) = #select(x->(x==1), digits(2^n, 3)); \\ Michel Marcus, Apr 04 2018
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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STATUS
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approved
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