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Often known as the loneliest number, one, in mathematics, is the smallest whole number, the first cardinal number, and the first and second number in the Fibonacci sequence, the infinite sequence of numbers in which each term is the sum of the two terms preceding it. The glyph used today in the Western world to represent one—a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom—traces its roots back centuries. Is one a prime number? Discuss
Source: The Free Dictionary