Etymology

Lucas number

Today it means: Any member of an integer sequence that has the same recursive relationship as the Fibonacci sequence, i.e. each term is the sum of the two previous terms, but with different starting values such that the ratios of successive terms approach the golden ratio. Full definition →

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The story

Named after the mathematician François Édouard Anatole Lucas.

Etymology from Wiktionary, CC BY-SA 4.0.