A Sequence of 0s and 1s is called an odd sequence if each of the Sums for , 1, ..., is odd.

**References**

Guy, R. K. ``Odd Sequences.'' §E38 in *Unsolved Problems in Number Theory, 2nd ed.*
New York: Springer-Verlag, pp. 238-239, 1994.

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1999-05-26