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A man named Leonardo Pisano, who was known by his nickname, Fibonacci, and named the series after himself, first discovered the Fibonacci sequence around 1200 A.D. The Fibonacci sequence is a sequence in which each term is the sum of the 2 numbers preceding it. The first 10 Fibonacci numbers are: (1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89). These numbers are obviously recursive.
The number system invented by the Indians was a combination of 10 digits. It is a place-value system, which means a zero is necessary for arithmetic operations. The Italian mathematician Fibonacci, also known as Leonardo Pisano Bigollo, introduced the Arabic numbers to Europe in the 12th century. Before the arrival of the number system, Roman figures were used instead.