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Solution to the Riddle?

Riddle #1: What's the next number in the following sequence? 1, 15, 81, 101, 818...

Hint: The sequence above has something to do with the following sequence: 4, 2, 6, 7

This riddle has multiple valid answers.

Note by Gabriella Nadia Suwanda
1 year, 10 months ago

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