The Cunningham Project seeks to factor the numbers b^n +- 1 for
b = 2, 3, 5, 6, 7, 10, 11, 12, up to high powers n.
The Cunningham tables are the tables in the book "Factorizations
of b^n +- 1, b = 2, 3, 5, 6, 7, 10, 11, 12 up to high powers,"
by John Brillhart, D. H. Lehmer, J. L. Selfridge, Bryant Tuckerman,
and S. S. Wagstaff, Jr., American Mathematical Society, Providence,
Rhode Island, third edition, 2002. Although the first two editions
were published as paper books, the third edition is an electronic
book available at http://www.ams.org/books/conm/022/ . Click
on "Third edition" to see the on-line machine-readable versions
of the tables.
Sam Wagstaff