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A317947
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Concatenate n and n-1 in binary.
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2
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10, 101, 1110, 10011, 101100, 110101, 111110, 1000111, 10011000, 10101001, 10111010, 11001011, 11011100, 11101101, 11111110, 100001111, 1000110000, 1001010001, 1001110010, 1010010011, 1010110100, 1011010101, 1011110110, 1100010111, 1100111000, 1101011001, 1101111010, 1110011011, 1110111100
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OFFSET
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1,1
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LINKS
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FORMULA
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MAPLE
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f:= proc(n) local A;
A:= convert(n-1, binary);
10^length(A)*convert(n, binary)+A
end proc:
f(1):= 10:
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PROG
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(PARI) zbinary(n) = if (n, binary(n), [0]);
a(n) = fromdigits(concat(zbinary(n), zbinary(n-1))); \\ Michel Marcus, Aug 12 2018
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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