The following is a calculator that computes the known prime factors of the numbers b^n +/- 1 (where b = 2,3,4,5,6,7,8,9,10,11,12.)

Use it in the following way:
1#) Enter the base b in the first textfield,
2#) then enter the power in the second textfield
3#) and finally enter +1 or -1 in the last textfield.

To report a bug please contact: Aly Azeem Khan - (please include number used).

To use the older applet version click here

a number: to the power of: +1 or -1: