213659domain: NPropertiesPrimalityPrimeyesAppears in sequencesprime(k) for those k where floor((2*(prime(k+1)-prime(k))*PrimePi(k) mod (8*k))/k) = m with m = 12.at n=21A109566Nearest prime to (prime(n)/2)^4.at n=13A185052Primes p such that q-p = 54, where q is the next prime after p.at n=19A204666Prime numbersat n=19103