
doi: 10.2307/3610706
If we take any integral number, and suppose it written round the circumference of a circle, it is possible to form differences by subtracting each digit from its neighbour on the right. If the result is negative, 10 is added to bring the answer positive. The second and successive differences may be formed similarly. It is found that at some stage the lines of differences start to repeat those occurring before.
Number theory
Number theory
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