A semiprime number—or a 2-almost prime—is the product of two prime numbers. The numbers 
and 
are semiprimes, but 
and 
are not. The semiprimes appear in three of Ramon Villamangca’s “Easy Sequences”: Cody Problems 52859, 52990, and 53740.
and are semiprimes, but and are not. The semiprimes appear in three of Ramon Villamangca’s “Easy Sequences”: Cody Problems 52859, 52990, and 53740. Write a function to list the semiprime numbers less than or equal to the input number.
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