48 = 1*48 = 2*24 = 3*16 = 4*12 = 6*8 (these are the ways 48 can be factored into a product of two numbers)

1 + 48 = 49 = 7*7 (not prime)

2 + 24 = 26 + 2*13 (not prime)

6 + 8 = 14 = 2*7 (not prime)

1 + 48 = 49 = 7*7 (not prime)

2 + 24 = 26 + 2*13 (not prime)

**3 + 16 = 19 (prime)**4 + 12 = 16 = 4*4 (not prime)6 + 8 = 14 = 2*7 (not prime)