47 is odd, so it is sum of even and odd. The only prime even number is 2, but corresponding 45 isn't prime. So may be 0 + 47? :)
Of course, it is valid for a 10-base calculations
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two prime numbers when added together will equal 63: 2 + 61
No two prime numbers satisfy that request.
2 and 2
127, 3 and 2
2, 3 and 13