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108, 162, 216 & 270
Consecutive
You don't. Any two numbers that are both even or both odd will add up to an even number. But, the two consecutive numbers that add up to 217 are 108 and 109. And I found THAT by dividing by 2 and rounding down and up. 217/2=108.5
It is called consecutive adding.
The numbers are 17 and 18.