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# 27121 Search

The **27121 Search**, a part of PrimeGrid, is a Distributed computing project, which searches for prime numbers of the form: 27 × 2^{n} ± 1 and 121 × 2^{n} ± 1.

## How to participate

The 27121 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.

## Result

The 27121 Search has currently 12 primes in the The Prime Pages. The bigger primes are 27 × 2^{1902689}-1 and 27 × 2^{2218064}+1, which weighs in at 572768 digits and 667706 digits, found on 2009-12-10 and 2009-12-23.