1,3
See A095029.
Table of n, a(n) for n=1..13.
Dan Gordon, List of Cyclic Difference Sets
Cf. A095025 number of cyclic difference sets with n elements, A095029-A095047 more examples of cyclic difference sets with k=5..20.
Sequence in context: A229552 A029518 A061954 * A022940 A025207 A027688
Adjacent sequences: A095036 A095037 A095038 * A095040 A095041 A095042
fini,full,nonn
Hugo Pfoertner, May 27 2004
approved