Let a and b be natural numbers, not both 1. Prove that if a +46 is...

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Let a and b be natural numbers, not both 1. Prove that if a +46 is prime, then a is odd and b is even. Hint: Note that x + 4y = [(x y) + y][(x + y) + y]. Let a and b be natural numbers, not both 1. Prove that if a +46 is prime, then a is odd and b is even. Hint: Note that x + 4y = [(x y) + y][(x + y) + y].