The Noether numbers for cyclic groups of prime order preprint Abstract: The Noether number of a representation is the largest degree of an element in a minimal homogeneous generating set for the corresponding ring of invariants. We compute the Noether number for an arbitrary representation of a cyclic group of prime order, and as a consequence prove the ``2p-$ conjecture''. Authors: P. Fleischmann, University of Kent, M. Sezer, Bo\u gazi\c ci University, R.J. Shank, University of Kent, C.F. Woodcock, University of Kent,