This Report (NM-R9609, March 1996) updates the tables of factorizations of $a^n pm 1$ for $13 le a < 100$, previously published as CWI Report NM-R9212 (June 1992) and updated in CWI Report NM-R9419 (September 1994). A total of 760 new entries in the tables are given here. The factorizations are now complete for $n < 67$, and there are no composite cofactors smaller than $10^{94$.

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Department of Numerical Mathematics [NM]
Large-scale computing

Brent, R. P., Montgomery, P. L., & te Riele, H. (1996). Factorizations of $ a ^ n $ + 1, 13 < a < 100 : update 2. Department of Numerical Mathematics [NM]. CWI.