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     FACTOR(1)                                               FACTOR(1)

     NAME
          factor, primes - factor a number, generate large primes

     SYNOPSIS
          factor [ number ]

          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**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 propor-
          tional 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.

     SOURCE
          /sys/src/cmd/factor.c
          /sys/src/cmd/primes.c

     Page 1                       Plan 9            (printed 10/26/25)