Fibonacci numbers

Fibonacci numbers
/fee'boh nah"chee/, Math.
the unending sequence 1, 1, 2, 3, 5, 8, 13, 21, 34, ... where each term is defined as the sum of its two predecessors. Also called Fibonacci sequence.
[1890-95; after Leonardo Fibonacci, 13th-century Italian mathematician]

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      the elements of the sequence of numbers 1, 1, 2, 3, 5, 8, 13, 21, …, each of which, after the second, is the sum of the two previous numbers. These numbers were first noted by the medieval Italian mathematician Leonardo Pisano (“Fibonacci”) in his Liber abaci (1202; “Book of the Abacus”), which also popularized Hindu-Arabic numerals (numeral system) and the decimal number system in Europe. For information on the interesting properties and uses of the Fibonacci numbers see number games: Fibonacci numbers (number game).

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