%I A028311
%S A028311 5,7,13,17,23,25,29,31,35,37
%N A028311 Odd numbers n such that {1..n-1} can be partitioned into disjoint sets 
               I, J with 2I = -J (mod n) such that I, J are unions of cyclotomic 
               cosets mod n.
%D A028311 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.
%Y A028311 Cf. A028312.
%Y A028311 Sequence in context: A091301 A040125 A106067 this_sequence A087155 A045442 
               A095283
%Y A028311 Adjacent sequences: A028308 A028309 A028310 this_sequence A028312 A028313 
               A028314
%K A028311 nonn,more
%O A028311 1,1
%A A028311 N. J. A. Sloane (njas(AT)research.att.com).