209621domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes p such that (12*p - 1, 12*p + 1) and (18*p - 1, 18*p + 1) are twin primes.at n=26A138660Prime-indexed primes q such that prime(q) + q + 1 is a prime-indexed prime.at n=35A318292Prime numbersat n=18773