250993domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form prime(n)*prime(n+1) - 4.at n=21A092761Primes of the form prime(x)*prime(x+1) - (prime(x+1)-prime(x)).at n=17A140120Primes of the form 9n^2 - 8.at n=29A201961Prime numbersat n=22115