Factors for 2n-1 and 2n+1 for 1200 < n < 10000:
List of factors in the Prime95 lowp.txt file format for:
Factors for 2^n+1, 1200 < n odd < 2000 or 2000 < n prime < 10000
Factors for 2^n+1, 1200 < n even < 2400 for n multiple of four
Factors for 2^n-1, 1200 < n odd < 2500
Factors for 2^n-1, for very large prime n, O(107) [GIMPS]
RELATED SITES: Cunningham Project; ECMNET; Brents table; Factor World.