88989899domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes that contain digits 8 and 9 only.at n=24A020472Primes consisting only of digits 8 and 9 occurring with equal frequency.at n=1A087538Primes p where the digital sum is equal to 68.at n=4A244918Prime numbersat n=5162014