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 /\oo/\ http://www.isthe.com/chongo/ ## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/