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40 (forty) is the natural number following 39 and preceding 41. Though the word is related to four (4), the spelling forty replaced fourty during the 17th century [ 1 ] [ 2 ] and is now the standard form.
42 is a pronic number, [1] an abundant number [2] as well as a highly abundant number, [3] a practical number, [4] an admirable number, [5] and a Catalan number. [6]The 42-sided tetracontadigon is the largest such regular polygon that can only tile a vertex alongside other regular polygons, without tiling the plane.
"A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]
English number words include numerals and various words derived from them, ... "forty-seven hundred forty-two", or "ninety-nine hundred ninety-nine". In British usage ...
40 or forty commonly refers to: 40 (number) one of the years 40 BC, AD 40, 1940, 2040; 40 or forty may also refer to: Music. 40 (record producer) (born 1983 ...
But even though the number of 40-year-olds with four-year degrees has increased since 1980, the number getting married decreased. The statistics point to a larger trend of today’s adults viewing ...
A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes.
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