
REFERENCES

J. Brillhart, J. Tonascia, and P. Weinberger, On the Fermat quotient, pp. 213222 of A. O. L. Atkin and B. J. Birch, editors, Computers in Number Theory. Academic Press, NY, 1971.
Richard K. Guy, Unsolved Problems in Number Theory, Springer, 2004, A3.
Peter L. Montgomery, New Solutions of a^(p1) = 1 (mod p^2), Math. Comp. 61 (1993), 361363.
Samuel Yates, The Mystique of Repunits, Math. Mag. 51 (1978), 2228.
