/usr/share/calc/custhelp/pmodm127 is in apcalc-common 2.12.5.0-1build1.
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 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | NAME
pmodm127 - calculate q mod 2^(2^127-1)
SYNOPSIS
custom("pmodm127", q)
TYPES
q int > 0
return int
DESCRIPTION
This custom function will return the value:
q mod 2^(2^127-1)
This custom function serves as a demonstration of how to write
a custom function. It performs the equivalent of:
pmod(2, 2^127-1, q)
The return value is integer in the half open range: [0, q).
SPECIAL NOTE:
Can you find a value, q, for which this custom function returns 1?
If you do, send the value of q to chongo using the EMail address
found at:
http://www.isthe.com/chongo/address.html
EXAMPLE
> custom("pmodm127", 65537)
32769
> custom("pmodm127", 2^31-1)
8
> custom("pmodm127", 7^51+2)
11228202966269457258557496419097462731193173
LIMITS
calc must be built with ALLOW_CUSTOM= -DCUSTOM
calc must be executed with a -C arg.
q must be an integer > 0
LIBRARY
none
SEE ALSO
custom
## Copyright (C) 2004 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: pmodm127,v 30.1 2007/03/16 11:10:04 chongo Exp $
## @(#) $Source: /usr/local/src/bin/calc/custom/RCS/pmodm127,v $
##
## Under source code control: 2004/02/25 07:13:15
## File existed as early as: 2004
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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