12
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The sum of the six numbers/6 = 12 The sum of the six numbers = 72 (72-6)/6=11
The sum of the prime numbers from 1 to 12 is equal to 2 + 3 + 5 + 7 + 11 = 28.
The numbers are 11, 12, 13, 14, 15 and 16.
1 + 14 2 + 13 3 + 12 4 + 11 5 + 10 6 + 9 7 + 8
The numbers are: 3 and 12