A Chen prime is a prime number p such that p+2 is either prime or semiprime. The number 17 is a Chen prime because 17+2 = 19 is a prime number, and the number 37 is a Chen prime because 37+2 = 39 = 3x13 is a semiprime.
Write a function to list Chen primes less than or equal to the input number
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William Chris Cleveland George Berken Christian Schröder

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