60487759domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest prime p(i) such that between 2p(i) and 2p(i+1) there exist n primes.at n=28A104380a(n) is the smallest prime q such that (r-q)/(q-p) = n, where p<q<r are consecutive primes (or 0 if no such prime exists).at n=27A179210Records in A179210.at n=9A278574Prime numbersat n=3589373