Problem 55275. List the semiprimes
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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Prime Numbers III
- 19 Problems
- 4 Finishers
- List the Moran numbers
- List the cuban primes
- Compute the largest number whose prime factors sum to n
- List the Beatriz numbers
- List the Euclid numbers
- List odd twin composites
- List the semiprimes
- Solve an equation involving primes and fractions
- List the two-bit primes
- List numbers such that every sum of consecutive positive integers ending in those numbers is composite
- Identify de Polignac numbers
- List the Fermi-Dirac primes
- Factor a number into Fermi-Dirac primes
- Compute the Sisyphus sequence
- Compute the bubble popper fidget spinner sequence
- Determine whether a number is a Zeisel number
- Express numbers as the sum of a prime, a square, and a cube
- Determine whether a number is a Gaussian prime
- List primes of the form xy+z
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