A028312 - OEIS

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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.

3, 9, 11, 15, 19, 21, 27, 33, 39 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	REFERENCES	`F. J. MacWilliams, A. M. Odlyzko, N. J. A. Sloane and H. N. Ward, Self-Dual Codes over GF(4), J. Combin. Theory, A 25 288-318 1978.`
	CROSSREFS	`Cf. A028311.` `Sequence in context: A106373 A190226 A059326 * A074486 A131861 A131859` `Adjacent sequences: A028309 A028310 A028311 * A028313 A028314 A028315`
	KEYWORD	`nonn,more`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 22:01 EST 2012. Contains 205667 sequences.