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Great Internet Mersenne Prime Search
Finding World Record Primes Since 1996

Now you can support the Great Internet Mersenne Prime Search (GIMPS)!

Contribute securely with your credit/debit card or bank through PayPal (or by mailed check, see below).

Amount:30  50  75  100  1,000 Other:

Your credit or debit card donation will be processed by PayPal, but creating a Paypal account is not required - look for the Continue link below "Don't have a PayPal account?" after you click the Donate button. The charge will appear as "PAYPAL *MERSENNE" or "Mersenne Research, Inc." on your statement.

Your donation is tax-deductible as allowed by law. GIMPS (Mersenne Research, Inc.) is a 501(c)(3) organization, tax ID 26-3446106.  Your charitable gift to GIMPS not-for-profit research funds operating expenses and research discovery awards. For more information about GIMPS please click here.

To donate a gift of any amount by mailed check or money order, please mail it payable to Mersenne Research at:

Mersenne Research
800 Via Bahia
San Marcos CA 92069, USA

For U.S. gift donations of $500 USD or more please include your return mailing address for a receipt.