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A028312
Odd numbers n such that {1..n-1} cannot be partitioned into disjoint sets I, J such that 2I = -J (mod n) and I, J are unions of cyclotomic cosets mod n.
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2
3, 9, 11, 15, 19, 21, 27, 33, 39
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 4 15:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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