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One of two (v,k,lambda)=(31,15,7) cyclic difference sets. The other one is A095042.
1

%I #7 Dec 24 2019 08:25:47

%S 1,2,3,4,6,8,12,15,16,17,23,24,27,29,30

%N One of two (v,k,lambda)=(31,15,7) cyclic difference sets. The other one is A095042.

%C See A095029.

%H Dan Gordon, <a href="http://web.archive.org/web/20101226230341/http://www.ccrwest.org/diffsets/ds_list.pdf">List of Cyclic Difference Sets</a>, (2003).

%H Dan Gordon, <a href="https://dmgordon.org/diffset">Difference Sets</a>, searchable database.

%Y Cf. A095025 (number of cyclic difference sets with n elements), A095029-A095047 (more examples of cyclic difference sets with k=5..20).

%K fini,full,nonn

%O 1,2

%A _Hugo Pfoertner_, May 27 2004