6 links
Robertson, John
hometown.aol.com
Pell's equation, computing in quadratic orders. Notes and resources.
Rose, Harvey
maths.bris.ac.uk
University of Bristol. Problems concerning small classes of recursive functions; Number theory of elliptic curves. Publications, teaching material.
Rubin, Karl
math.uci.edu
University of California, Irvine. Arithmetic algebraic geometry. Publications, lecture notes.
Rubinstein, Michael
math.uwaterloo.ca
University of Waterloo. Experimental number theory. Publications, software for L-functions, tables of modular polynomials.