Define a positive integer n to be a “factorial tail” if there is some positive integer m such that the base-ten representation of m! ends with exactly n zeros. How many positive integers less than 1992 are not factorial tails?
Define a positive integer n to be a “factorial tail” if there is some positive integer m such that the base-ten representation of m! ends with exactly n zeros. How many positive integers less than 1992 are not factorial tails?