Catalan number

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

In mathematics, the Catalan numbers are a sequence of natural numbers that occur in various counting problems, often involving recursively defined objects. They are named after Eugène Catalan, though they were previously discovered in the 1730s by Minggatu.

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

Image: The original uploader was Jasampler at Spanish Wikipedia., Public domain, via Wikimedia Commons.