/usr/share/calc/help/prevprime 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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prevprime - nearest prime less than specified number
SYNOPSIS
prevprime(n [,err])
TYPES
n real
err integer
return positive integer or err
DESCRIPTION
If n is an integer and 2 < n < 2^32, prevprime(n) returns the
nearest prime less than n.
If n <= 2 or >= 2^32 or n is fractional, prevprime(n, err)
returns the value of err.
Other cases cause a runtime error.
EXAMPLE
; print prevprime(10), prevprime(100), prevprime(1e6)
7 97 999983
; print prevprime(2,-99), prevprime(2^32,-99)
-99 -99
; print prevprime(2)
pprime arg 1 is <= 2
LIMITS
2 < n < 2^32
LINK LIBRARY
FULL zpprime(ZVALUE z)
SEE ALSO
factor, isprime, lfactor, nextcand, nextprime, prevcand,
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: prevprime,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/cmd/calc/help/RCS/prevprime,v $
##
## Under source code control: 1995/12/18 12:34:58
## 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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