/usr/share/calc/help/frem is in apcalc-common 2.12.4.4-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | NAME
    frem - remove specified integer factors from specified integer
SYNOPSIS
    frem(x,y)
TYPES
    x		integer
    y		integer
    return	non-negative integer
DESCRIPTION
    If x and y are not zero and n is the largest non-negative integer
    for which y^n is a divisor of x, frem(x,y) returns abs(x/y^n).
    In particular, abs(x) is returned if x is not divisible by
    y or if abs(y) = 1.	 If abs(y) > 1, frem(x,y) is the greatest
    divisor of x not divisible by y.
    For all x, frem(x,0) is defined to equal abs(x).
    For all y, frem(0,y) is defined to be zero.
    For all x and y, abs(x) = frem(x,y) * abs(y) ^ fcnt(x,y).
EXAMPLE
    ; print frem(7,4), frem(24,4), frem(48,4), frem(-48,4)
    7 6 3 3
LIMITS
    none
LINK LIBRARY
    NUMBER *qfacrem(NUMBER *x, NUMBER *y);
SEE ALSO
    fcnt, gcdrem
## 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.
## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: frem,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/frem,v $
##
## Under source code control:	1995/12/18 12:03:02
## 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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