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It is: 1318 plus 19 = 1337
81 - 50 = 31 50 - 19 = 31
47 + 3 = 50, 43 + 7 = 50, 37 + 13 = 50, and 31 + 19 = 50. 4 pairs of prime numbers have a sum of 50. 53 + 7 = 60, 47 + 13 = 60, 43 + 17 = 60, 41 + 19 = 60, 37 + 23 = 60, and 31 + 29 = 60. 6 pairs of prime numbers have a sum of 60.
The sum of 19 and 9 is 28.
The sum of 19 and 32 is 51.