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75 lines
1.9 KiB
Plaintext
75 lines
1.9 KiB
Plaintext
NAME
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pmodm127 - calculate q mod 2^(2^127-1)
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SYNOPSIS
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custom("pmodm127", q)
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TYPES
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q int > 0
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return int
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DESCRIPTION
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This custom function will return the value:
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q mod 2^(2^127-1)
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This custom function serves as a demonstration of how to write
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a custom function. It performs the equivalent of:
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pmod(2, 2^127-1, q)
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The return value is integer in the half open range: [0, q).
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SPECIAL NOTE:
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Can you find a value, q, for which this custom function returns 1?
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If you do, send the value of q to chongo using the Email address
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found at:
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http://www.isthe.com/chongo/address.html
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EXAMPLE
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> custom("pmodm127", 65537)
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32769
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> custom("pmodm127", 2^31-1)
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8
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> custom("pmodm127", 7^51+2)
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11228202966269457258557496419097462731193173
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LIMITS
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calc must be built with ALLOW_CUSTOM= -DCUSTOM
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calc must be executed with a -C arg.
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q must be an integer > 0
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LIBRARY
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none
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SEE ALSO
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custom
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## Copyright (C) 2004,2021 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 2004/02/25 07:13:15
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## File existed as early as: 2004
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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