FACTOR(1) FACTOR(1) NAME factor, qfactor, primes - factor a number, generate large primes SYNOPSIS factor [ number ] qfactor primes [ start [ finish ] ] DESCRIPTION Factor prints number and its prime factors, each repeated the proper number of times. The number must be positive and less than 2**56 (about 7.2e16) If no number is given, factor reads a stream of numbers from the standard input and factors them. It exits on any input not a positive integer. Maximum running time is propor- tional to sqrt(n). Qfactor reads one number from the standard input and factors it. It will factor numbers up to about 40 digits. For large numbers it is much faster than factor. Primes prints the prime numbers ranging from start to finish, where start and finish are positive numbers less than 2**56. If finish is missing, primes prints without end; if start is missing, it reads the starting number from the standard input.