factor man page on UNIXv7

factor man page on UNIXv7

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FACTOR(1)							     FACTOR(1)

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

SYNOPSIS
       factor [ number ]

       primes

DESCRIPTION
       When factor is invoked without an argument, it waits for a number to be
       typed in.  If you type in  a  positive  number  less  than  256	(about
       7.2e16) it will factor the number and print its prime factors; each one
       is printed the proper number of times.  Then it waits for another  num‐
       ber.  It exits if it encounters a zero or any non-numeric character.

       If  factor  is invoked with an argument, it factors the number as above
       and then exits.

       Maximum time to factor is proportional to sqrt(n) and occurs when n  is
       prime  or  the  square of a prime.  It takes 1 minute to factor a prime
       near 1014 on a PDP11.

       When primes is invoked, it waits for a number to be typed in.   If  you
       type  in	 a  positive  number  less  than  256 it will print all primes
       greater than or equal to this number.

DIAGNOSTICS
       `Ouch.' for input out of range or for garbage input.

								     FACTOR(1)

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