Perrin number

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Notion

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Science and technology

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What Wikipedia says

In mathematics, the Perrin numbers are a doubly infinite constant-recursive integer sequence with characteristic equation x3 = x + 1. The Perrin numbers, named after the French engineer Raoul Perrin, bear the same relationship to the Padovan sequence as the Lucas numbers do to the Fibonacci sequence.

Excerpt from the Wikipedia article “Perrin number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hyacinth, Public domain, via Wikimedia Commons.