42981929domain: NPropertiesPrimalityPrimeyesAppears in sequencesInitial members of prime septuplets (p, p+2, p+8, p+12, p+14, p+18, p+20).at n=12A022010Primes p in prime septuplets (p, p+2, p+8, p+12, p+14, p+18, p+20) at the end of the maximal gaps in A201251.at n=5A233038Initial members of prime septuplets.at n=21A257124Prime numbersat n=2603495