FACTOR(1)                   General Commands Manual                  FACTOR(1)

       factor, primes - factor a number, generate large primes

       factor [ number ]

       primes [ start [ finish ] ]

       Factor prints number and its prime factors, each repeated the proper
       number of times.  The number must be positive and less than 2**54
       (about 1.8e16)

       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 proportional to sqrt(n).

       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.