Gcwsieve

Description

gcwsieve (and gcwsievecl) are used to create sieve files for a (General) Woodall prime or (General) Cullen prime sequence.

Those software was developed by Geoffrey Reynolds and both part of the package Mtsieve.

Commands overview

Help with gcwsieve -h.

Installation

Create a folder containing the sieve program.

Creating a new sieve

Example:

gcwsieve.exe -s- -b1024 -n2 -N5000 -P1000000000

Parameters:

• -s-: using Woodall (Cullen: -s+)
• -b1024: using base 1024
• -n2: lowest n-value
• -N5000: highest n-value
• -P1000000000: highest prime to search for

After running the file "gcw_b1024.pfgw" in ABC fileformat will be created.

Continuing an existing sieve file

To continue the search call this (from example above): gcwsieve.exe -s- -b1024 -n2 -N5000 -P2000000000 -igcw_b1024.pfgw

Parameters:

• -igcw_b1024.pfgw: the standard output from first run is used as input file
• A new sieve depth is used, too.

See also

• Mtsieve

Sieving program

Program

NewPGen MultiSieve Srsieve Gcwsieve PPSieve AthGFNSieve FermFact Fermat GMP-Fermat TwinGen

Tools

Mtsieve

Links

MersenneForum FermatSearch