20 4 16 37 58 89 42. This sequence doesn't make sense. However, if you add a number among them, it becomes a cyclical sequence. Which number do you need to add, and between which numbers?

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145 between 89 and 42. (Take the digits of the previous number, square them, then add them together.)

20 4 16 37 58 89 42. This sequence doesn't make sense. However, if you add a number among them, it becomes a cyclical sequence. Which number do you need to add, and between which numbers?

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