178921domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that (12*p - 1, 12*p + 1) and (18*p - 1, 18*p + 1) are twin primes.at n=23A138660Primes of the form 9n^2 - 8.at n=26A201961Primes of the form 2520k + 1 for some k.at n=27A217588Prime numbersat n=16242