149749domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(1)=3, b(n) = Product_{k=1..n} a(k), a(n+1) is the smallest prime factor of b(n)-1.at n=44A005265G.f.: Product_{i>=1, j>=1, k>=1, l>=1} (1 + x^(i*j*k*l)).at n=19A280486Prime numbersat n=13827