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- The first two Fibonacci numbers are both 1. Afterward, each Fibonacci number is the sum of the two previous numbers.
- A prime number is a natural number with exactly two divisors: 1 and itself. 1 is not prime since 1 is itself.
- A square number is obtained by multiplying some natural number by itself. Multiplying by the same number again produces a cube.
- A positive number is a real number greater than 0.

Last Updated: Sep 21, 2017

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