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Fermat Prime Days

Date of birth

Enter your date of birth. Find out when you will be celebrating!

Fermat Prime Days occur when your day age is a Fermat prime number.

Fermat primes are of the form 2^2ⁿ

As of 2011 these are the only known Fermat primes, and conjecturally the only Fermat primes.

We have yet to hear from someone who has held a Fermat Prime Day party.