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A066330
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Binary string which equals n when 1's, 2's, 4's and 8's bits have weights 1, 2, 4, 5 respectively, while the other bits have their usual weights. -1 if no such string exists.
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1
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0, 1, 10, 11, 100, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111, -1, -1, -1, 10000, 10001, 10010, 10011, 10100, 11000, 11001, 11010, 11011, 11100, 11101, 11110, 11111, -1, -1, -1, 100000, 100001, 100010, 100011, 100100, 101000, 101001, 101010, 101011, 101100, 101101, 101110, 101111, -1, -1, -1
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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There are engineering reasons for this encoding, but it is unsatisfactory from a mathematical point of view since 5 could equally well be 101.
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REFERENCES
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John M. Yarbrough, Digital Logic Applications and Design, West Publishing, 1997, p. 26
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LINKS
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Table of n, a(n) for n=0..47.
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CROSSREFS
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Cf. A066335, A066338.
Sequence in context: A108779 A171782 A038313 * A125099 A055611 A077813
Adjacent sequences: A066327 A066328 A066329 * A066331 A066332 A066333
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KEYWORD
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sign
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AUTHOR
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George E. Antoniou (george.antoniou(AT)montclair.edu), Dec 15 2001
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EXTENSIONS
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More terms from Joshua Zucker, Jun 21 2006
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STATUS
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approved
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