12121 Search

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The 12121 Search is a project, which searches for prime numbers of the form: 121 × 2n-1, it also searches for primes of 121 × 2n+1 after being a partner of PrimeGrid. Its sister project, the 2721 Search, searches for primes of 27 × 2n-1.

How to participate

The 12121 site features a brilliant reservation system, which makes it easy to use prpclient to reserve a testing number directly from the website. Then this application will use LLR or PFGW to test this testing number and afterwards submit the result back via the website.

Results

The 12121 Search has currently 7 primes in the Top 5000 Prime Database[1], their largest number is 121 × 22033941-1 which weighs in at 612280 digits. This prime was found on January 28th 2006.

See also

External links