(15/5) + (2*4) = 3 + 8 = 11
The parentheses are not actually necessary but help make the sum clearer.
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1 + 14 2 + 13 3 + 12 4 + 11 5 + 10 6 + 9 7 + 8
All except 15
15 and 5
19 and 11 are the two prime numbers that equal to 209.
13-2 = 11