443089domain: NPropertiesPrimalityPrimeyesAppears in sequencesTrajectory of 1 under map n->39n+1 if n odd, n->n/2 if n even.at n=19A033975Primes that divide exactly one pandigital number (A050278 - each digit 0-9 appears exactly once, no leading zero).at n=35A318787Prime numbersat n=37186