10343903domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest prime p such that there is a gap of 2*prime(n) between p and previous prime.at n=19A080083a(n) = least prime P(n) such that P(n)-2*p(n) is prime and P(n+1)>P(n) with p(n)=n-th prime.at n=19A115972Prime numbersat n=685904