Fibonacci number
noun
Fi·bo·nac·ci number
ˌfē-bə-ˈnä-chē-
ˌfi-bə-
: an integer in the infinite sequence 1, 1, 2, 3, 5, 8, 13, … of which the first two terms are 1 and 1 and each succeeding term is the sum of the two immediately preceding
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Merriam-Webster unabridged
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