35615581domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form k^4 + k^3 + k^2 + k + 1.at n=21A088548Primes of the form n^4 + n^3 + n^2 + n + 1 where n is nonprime.at n=13A193366Primes of the form (k^p-1)/(k-1) not having representation in the form (m^q+1)/(m+1), where k,m > 1 and p,q > 2.at n=30A225148Prime numbersat n=2182164