303595777domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form k^4 + 1.at n=20A037896Primes of the form: 1 + sigma(n)^4.at n=21A259310Integers with only one prime factor and whose Euler's totient is a perfect biquadrate.at n=27A307690Prime numbersat n=16436502