994949domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that contain digits 4 and 9 only.at n=10A020466Primes of the concatenated form 9nn9.at n=18A102503Primes whose digits do not appear in three previous terms.at n=26A107367Primes of the form n^3 - T(n) - 1 where T(n) is the n-th triangular number.at n=18A229960Prime numbersat n=78135