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No, 2017 written as separate numbers are 2 0 1 7 and adding them up gives 10. Half of 10 is 5 (obviously) and that sum is 15. Get it?

or perhaps 0 is some kind of infix flip-subtract operator

a 0 b := b - a

Call in Ramanujan. He'll surely come up with a good explanation.

"No! It is a very interesting number. It is the smallest positive integer that Microsoft have not yet used as a version number."

Actually that would be 13.0!