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2023 (Posted on 2023-04-22) Difficulty: 4 of 5
The number representing the current year is both divisible by 7 and so is the sum of its digits. This feature allows me to take the liberty and to call it a SEPTEMVIRAL year, or shortly SY.

Now, the puzzle:
What span of 1000 years (from X to X+999) containing 2023, provides the highest quantity of SYs?

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Solutioncomputer solutionCharlie2023-04-22 20:30:44
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