D - Five, Five Everywhere

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  • Thoughts.
    • What do we do with the condition that any five different additions are a composite number?
    • From the condition of being distinct primes, when 2 is included, the sum is even, so the composite number
    • In other words, we can consider the condition that the composite number is obtained by adding five odd prime numbers that are different from each other
    • For example, if all of them are “divided by 5 and less than 1”, then any of them can be chosen and added together to make a multiple of 5.
    • If there are 55 prime numbers divided by 5 and less than 1 by 55555, it is OK.
  • Official Explanation OK

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