Abstract. We say that a regular graph G of order n and degree r 1 (which is not a complete graph) is
strongly regular if there exist nonnegative integers τ and θ
such that S_{i} S_{j}
= τ for any two adjacent vertices i
and j, and S_{i} S_{j}
= θ for any two distinct nonadjacent vertices i and j, where S_{k} denotes the
neighborhood of the vertex k. We
here describe the parameters n, r, τ and θ for strongly
regular graphs of order 6(2p+1),
where 2p+1 is a prime number.
