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1. Place any four non-negative integers around a circle
2. For all pairs of adjacent numbers subtract the smaller from the bigger
3. Write the results on an outer concentric circle
4. Repeat

Eventually, four equal numbers will occur!

Source

Sequence A038371.

Smallest prime factor of 10^n+1.

2, 11, 101, 7, 73, 11, 101, 11, 17, 7, 101, 11, 73, 11, 29, 7, 353, 11, 101, 11, 73, 7, 89, 11, 17, 11, 101, 7, 73, 11, 61, 11, 19841, 7, 101, 11, 73, 11, 101, 7, 17, 11, 29, 11, 73, 7, 101, 11, 97, 11, 101, 7, 73, 11, 101, 11, 17, 7, 101, 11, 73, 11, 101, 7, 1265011073, ...

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