plan9 man page for factor

FACTOR(1)						      General Commands Manual							 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**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 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.

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

																	 FACTOR(1)