/usr/share/calc/help/lfactor is in apcalc-common 2.12.4.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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lfactor - smallest prime factor in first specified number of primes
SYNOPSIS
lfactor(n, m)
TYPES
n integer
m nonnegative integer <= 203280221 (= number of primes < 2^32)
return positive integer
DESCRIPTION
This function ignores the signs of n and m, so here we shall
assume n and limit are both nonnegative.
If n is nonzero and abs(n) has a prime proper factor in the first
m primes (2, 3, 5, ...), then lfactor(n, m) returns the smallest
such factor. Otherwise 1 is returned.
If n is nonzero and m = pix(limit), then lfactor(n, m) returns the
same as factor(n, limit).
Both lfactor(n, 0) and lfactor(1, m) return 1 for all n and m.
Also lfactor(0, m) always returns 1, and factor(0, limit) always
returns 2 if limit >= 2.
EXAMPLE
; print lfactor(35,2), lfactor(35,3), lfactor(-35, 3)
1 5 5
; print lfactor(2^32+1,115), lfactor(2^32+1,116), lfactor(2^59-1,1e5)
1 641 179951
LIMITS
m <= 203280221 (= number of primes < 2^32)
LINK LIBRARY
NUMBER *qlowfactor(NUMBER *n, NUMBER *count)
FULL zlowfactor(ZVALUE z, long count)
SEE ALSO
factor, isprime, nextcand, nextprime, prevcand, prevprime,
pfact, pix, ptest
## Copyright (C) 1999-2006 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.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: lfactor,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/lfactor,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/
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