128.5 if you're talking about consecutive numbers.
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257/2 = 128.5 so 128 and 129
-257
round off each of the numbers and add together: 114 + 257 is about 110 + 260 = 370. Exactly how you round off or approximate the numbers depends on how good you need the estimate to be.
1 and 257. It is a prime.
You must add either two odd numbers or two even numbers.