959999domain: NAppears in sequencesLargest n-digit right-truncatable semiprime.at n=5A213019Numbers that have the largest possible remainder when divided by their digit sum.at n=34A348799a(1) = 2, a(n) = k - 1, where k is the least number greater than a(n-1) such that rad(k) | a(n-1), where rad(n) = A007947(n).at n=18A365413