384160001domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form k^4 + 1.at n=21A037896Primes of the form n^4+1 such that (n+2)^4+1 is also prime.at n=6A217796Primes of the form: 1 + sigma(n)^4.at n=19A259310Integers with only one prime factor and whose Euler's totient is a perfect biquadrate.at n=28A307690Prime numbersat n=20536030