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A159481
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Number of evil numbers <= n, cf. A001969.
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6
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1, 1, 1, 2, 2, 3, 4, 4, 4, 5, 6, 6, 7, 7, 7, 8, 8, 9, 10, 10, 11, 11, 11, 12, 13, 13, 13, 14, 14, 15, 16, 16, 16, 17, 18, 18, 19, 19, 19, 20, 21, 21, 21, 22, 22, 23, 24, 24, 25, 25, 25, 26, 26, 27, 28, 28, 28, 29, 30, 30, 31, 31, 31, 32, 32, 33, 34, 34, 35, 35, 35, 36, 37, 37, 37
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| a(n) = n + 1 - A115384(n);
n/a(n)-->1/2.
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LINKS
| R. Zumkeller, Table of n, a(n) for n = 0..10000
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FORMULA
| a(n) = SUM(A010059(n): 0<=k<=n).
a(n)=floor(n/2)-(1+(-1)^n)*(1-(-1)^A000120(n))/4+1. [From Vladimir Shevelev (shevelev(AT)bgu.ac.il), May 27 2009]
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EXAMPLE
| a(10) = #{0,11,101,110,1001,1010} = #{0,3,5,6,9,10} = 6.
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CROSSREFS
| Sequence in context: A112325 A029111 A092038 * A194206 A046699 A102548
Adjacent sequences: A159478 A159479 A159480 * A159482 A159483 A159484
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 16 2009
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