The sum of 622 and 84 is 706.
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622+285 = 907
If two prime number have a sum of 54 they cannot have a sum of 84, and conversely.
How about: 37+47 = 84
There are four consecutive 3-digit numbers with a sum of 2,494: 622, 623, 624 and 625.
27,28,29The sum of which is 84.