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AccountMaker , (edited )

But what about 14, 21 and 28?

14 - 4*2 = 6, not divisible by 7

21 - 1*2 = 19, not divisible by 7

28 - 8*2 = 12, not divisible by 7

Or did I misunderstand the algorithm?

EDIT: I didn’t realize that you remove the last digit when subtracting, got corrected in the replies.

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