Topological Hochschild homology of

This paper gives a computation of topological Hochschild homology for for any prime p and any number n≥2 based on Bökstedtʹs computation of topological Hochschild homology for . The most important idea in the computation is to consider as a filtered ring, and to construct a spectral sequence for topological Hochschild homology of a filtered ring. The product on topological Hochschild homology is used extensively, and a direct description of this product is given.