6371401domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest prime producing a gap with the next prime, the size of the gap being a composite number with 2n+1 as a factor.at n=21A217724a(n) is the smallest prime p such that the gap between p and the next prime is 4*n.at n=33A301925Prime numbersat n=436612