1. a `and' b, a `or' b, `not' a
2. find a primitive root modulo p
4. multiplicative order of x in Zn
6. integer quotient when a is divided by b
7. To start and stop a log file of your session.
8. chinese remainder theorem applied to x and y (note)
10. first prime larger or smaller than a
11. time of last computation
12. inverse of the integer a modulo n gcd(a,n)=1
16. convert an element x of Zn to an integer (see note)
17. define powermod function
18. a raised to the power b (see powermod below)
20. add/subtract z and w on elliptic curve E