id:A028312 - OEIS Search Results

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

	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: A075720 A106373 A059326 this_sequence A074486 A131861 A131859` `Adjacent sequences: A028309 A028310 A028311 this_sequence A028313 A028314 A028315`
	KEYWORD	`nonn,more`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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