227233domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that are concatenations of k with k + 6.at n=31A032629Lucky numbers that are decimal concatenations of n with n + 6.at n=25A032656Primes of the form 2*n^2 + 70*n + 33.at n=20A217499Primes that are the concatenation of prime(n) and prime(n+2).at n=12A253245Prime numbersat n=20200