3 (number)

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Pronunciation of the number 3

The number three (3) is one more than two and one less than four. It is the first Mersenne prime. Three is an important number for many cultures (groups of people living together). It is also a prime number. It is the first odd prime. In Roman numerals, it is III. It is the only prime number <math>p</math> for which both <math>p</math> and <math>p-1</math> are prime.[source?]

Famous threes