/usr/share/calc/help/isprime 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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isprime - whether a small integer is prime
SYNOPSIS
isprime(x [,err])
TYPES
x int
err int
return int
DESCRIPTION
Determine if x is is a small prime. This function will return
1 if x is a small prime. If x is even, this function will
return 0. If x is negative or a small composite (non-prime),
0 will be returned.
If x is a large positive odd value and the err argument is
given, this function return err. If x is a large positive odd
value and the err argument is not given, an error will be
generated.
Note that normally this function returns the integer 0 or 1.
If err is given and x is a large positive odd value, then err
will be returned.
EXAMPLE
; print isprime(-3), isprime(1), isprime(2)
0 0 1
; print isprime(21701), isprime(1234577), isprime(1234579)
1 1 0
; print isprime(2^31-9), isprime(2^31-1), isprime(2^31+11)
0 1 1
; print isprime(2^32+1, -1), isprime(3^99, 2), isprime(4^99, 2)
-1 2 0
LIMITS
err not given and (y is even or y < 2^32)
LINK LIBRARY
FLAG zisprime(ZVALUE x) (return 1 if prime, 0 not prime, -1 if >= 2^32)
SEE ALSO
factor, lfactor, 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: isprime,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/isprime,v $
##
## Under source code control: 1994/10/21 02:21:29
## File existed as early as: 1994
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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