Problem 51077. List composite numbers that cannot be written as the sum of two primes

The number 32 is a composite number that can be written as the sum of two primes in two ways: 3+29 and 13+19. The number 33 can be written as the sum of two primes in one way: 2+31. The number 35 cannot be written as the sum of two primes at all.
Write a function to list the composite numbers less than or equal the input that cannot be written as the sum of two primes. Remember that 1 is neither prime nor composite.
Problems that might be related include Cody Problem 60 and Cody Problem 46582.

Solution Stats

48.28% Correct | 51.72% Incorrect
Last Solution submitted on Nov 20, 2023

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