15625591domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digit 1, at least one of digits 2,3, at least one of digits 4,5,6 and at least one of digits 7,8,9.at n=7A126632Prime numbersat n=1008512