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Search: id:A143220
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| A143220 |
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a(0)=1. For n >=1, a(n) = 1 if the binary representation of n occurs at least once in the concatenation of (a(0),a(1),...,a(n-1)). a(n) = 0 otherwise. |
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+0
3
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| 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0
(list; graph; listen)
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OFFSET
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0,1
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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EXAMPLE
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The binary representation of 21 is 10101. This occurs in the concatenation of terms a(0) through a(20) like so: 1101011000111(10101)001. So a(21) = 1.
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MATHEMATICA
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f[l_List]:=Append[l, Boole[StringPosition[ToString[FromDigits[l]], ToString[FromDigits[IntegerDigits[Length[l], 2]]]]!={}]]; Nest[f, {1}, 125] [From Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 09 2008]
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CROSSREFS
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Cf. A118268, A143221, A143222.
Sequence in context: A104120 A108336 A118268 this_sequence A136669 A103842 A065535
Adjacent sequences: A143217 A143218 A143219 this_sequence A143221 A143222 A143223
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KEYWORD
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base,nonn
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AUTHOR
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Leroy Quet, Jul 30 2008
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 09 2008
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