20639383domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest prime factor of n!+1.at n=20A051301Smallest prime p associated with A064164(n).at n=9A064229Smaller of the two factors of the n-th semiprime number of the form m!+1.at n=9A082952Lesser prime factor of semiprimes in A089539.at n=19A089540Prime numbersat n=1308543