NAME
    factor - smallest prime factor not exceeding specified limit

SYNOPSIS
    factor(n [, limit [, err]])

TYPES
    n		integer
    limit	integer with abs(limit) < 2^32, defaults to 2^32 - 1
    err		integer

    return	positive integer, -1 or err

DESCRIPTION

    If n >= 0 and n has a prime factor less than or equal to limit,
    factor(n, limit) returns the smallest such factor.	If n >= 0
    and the smallest prime factor of n exceeds limit, 1 is returned.
    In particular, if n >= 0 and limit <= 1, factor(n, limit)
    always returns 1; factor(n,2) returns 2 if and only if n is even.

    If n < 0, -1 is returned.

    If abs(limit) >= 2^32, factor(n, limit) causes an error,
    factor(n, limit, err) returns the value of err.

EXAMPLE
    > print factor(35,4), factor(35,5), factor(35), factor(-35)
    1 5 5 -1

    > print factor(2^32 + 1), factor(2^47 - 1), factor(2^59 - 1)
    641 2351 179951

LIMITS
     none

LINK LIBRARY
     FLAG zfactor(ZVALUE n, ZVALUE limit, ZVALUE *res)

SEE ALSO
    lfactor

## Copyright (C) 1999  Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
## or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL.  You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 59 Temple Place, Suite 330, Boston, MA  02111-1307, USA.
##
## @(#) $Revision: 29.2 $
## @(#) $Id: factor,v 29.2 2000/06/07 14:02:33 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/factor,v $
##
## Under source code control:	1995/12/18 12:34:57
## File existed as early as:	1995
##
## chongo <was here> /\oo/\	http://www.isthe.com/chongo/
## Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
