10300271domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(1)=2; thereafter a(n) = mpf(1+Product_{k=1..n-1} a(k)), where mpf(n) = f-th prime factor with multiplicity of n, for f=ceiling(bigomega(n)/2).at n=10A261564Prime numbersat n=683189