Apparently eu = EulerPhi; co[n_] := n - eu[n]; is missing jf 2013/5/29 Harvey P. Dale <hpd at hpdale.org> > The Mma program in the above sequence does not produce anything > like the terms of the sequence. > Best, > Harvey > > > > > _______________________________________________ > > Seqfan Mailing list - http://list.seqfan.eu/ >