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A084474
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Write n in binary and replace 0 with 0000.
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2
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1, 10000, 11, 100000000, 100001, 110000, 111, 1000000000000, 1000000001, 1000010000, 1000011, 1100000000, 1100001, 1110000, 1111, 10000000000000000, 10000000000001, 10000000010000, 10000000011, 10000100000000
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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Table[FromDigits[Flatten[IntegerDigits[n, 2]/.{0->{0, 0, 0, 0}}]], {n, 20}] (* Harvey P. Dale, Feb 19 2013 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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