factor

FACTOR(6)                        Games Manual                        FACTOR(6)



NAME
       factor, primes - factor a number, generate primes

SYNOPSIS
       factor [ number ] ...

       primes [ start [ stop ]]

DESCRIPTION
       The factor utility will factor integers between -2147483648 and
       2147483647 inclusive.  When a number is factored, it is printed,
       followed by a ``:'', and the list of factors on a single line.  Factors
       are listed in ascending order, and are preceded by a space.  If a
       factor divides a value more than once, it will be printed more than
       once.

       When factor is invoked with one or more arguments, each argument will
       be factored.

       When factor is invoked with no arguments, factor reads numbers, one per
       line, from standard input, until end of file or error.  Leading white-
       space and empty lines are ignored.  Numbers may be preceded by a single
       - or +.  Numbers are terminated by a non-digit character (such as a
       newline).  After a number is read, it is factored.  Input lines must
       not be longer than 255 characters.

       The primes utility prints primes in ascending order, one per line,
       starting at or above start and continuing until, but not including
       stop.  The start value must be at least 0 and not greater than stop.
       The stop value must not be greater than 4294967295.  The default value
       of stop is 4294967295.

       When the primes utility is invoked with no arguments, start is read
       from standard input.  Stop is taken to be 4294967295.  The start value
       may be preceded by a single +.  The start value is terminated by a non-
       digit character (such as a newline).  The input line must not be longer
       than 255 characters.

DIAGNOSTICS
       Out of range or invalid input results in `ouch' being written to
       standard error.

BUGS
       Factor cannot handle the ``10 most wanted'' factor list, primes won't
       get you a world record.



4.4 Berkeley Distribution        June 23, 1990                       FACTOR(6)