116269domain: NPropertiesPrimalityPrimeyesAppears in sequencesSmallest number that requires n steps to reach 0 when iterating the mapping k -> abs(reverse(lpd(k))-reverse(Lpf(k))). lpd(k) is the largest proper divisor and Lpf(k) is the largest prime factor of k.at n=22A076424Prime numbersat n=10985