22044961domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the smallest prime p such that 2^(p-1) == 1 (mod a(1)*...*a(n-1)*p).at n=20A175257Primes of the form 2*k!!! + 1.at n=8A217648Prime numbersat n=1391967