SOLUTION: what type of number is closed under subtraction? prime numbers

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Question 552009: what type of number is closed under subtraction?
prime numbers
Answer by solver91311(24713) About Me  (Show Source):
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If the primes are closed under subtraction, then the result of any prime subtracted from any prime will have a prime result. Is 7 minus 3 a prime number?

John

My calculator said it, I believe it, that settles it
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