happy numbers tagged posts

Happy Numbers and Unhappy Numbers (1)

Author: Lotertius

There is website, HAD2KNOW.COM (if you have the interest, you can go and check it out), reporting the following information:

They use the method of splitting any number into its[……]

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(中文) 快樂數字與不快樂數字(二)

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(中文) 快樂數字與不快樂數字(三)

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