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  Pi

  Pi or π is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle's area to the square of its radius. The symbol π was first proposed by the Welsh mathematician William Jones in 1706. It is...
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  0

  0 (zero) is both a number and the numerical digit used to represent that number in numerals. It plays a central role in mathematics as the additive identity of the integers, real numbers, and many other algebraic structures. As a digit, zero is used as a placeholder in place value systems. In the...
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  42

  42 (forty-two) is the natural number following 41 and preceding 43. The number has received considerable attention in popular culture due to its appearance in the The Hitchhiker's Guide to the Galaxy, as "the Answer to the Ultimate Question of Life, the Universe, and Everything." Forty-two is an...
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  0.999...

  In mathematics, the repeating decimal 0.999… which may also be written as or denotes a real number equal to one. In other words, the notations 0.999… and 1 represent the same real number. This equality has long been accepted by professional mathematicians and taught in textbooks. Proofs have been...
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  2147483647

  The number 2,147,483,647 is the eighth Mersenne prime, equal to 2 − 1. It is one of only four known double Mersenne primes. The primality of this number was proved by Leonhard Euler, who reported the proof in a letter to Daniel Bernoulli written in 1772. Euler used trial division, improving on...