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An irreducible fraction (or fraction in lowest terms, simplest form or reduced fraction) is a fraction in which the numerator and denominator are integers that have no other common divisors than 1 (and −1, when negative numbers are considered). [1]
240 is the algebraic polynomial degree of sixteen-cycle logistic map, . [9] [10] [11] 240 is the number of distinct solutions of the Soma cube puzzle. [12] There are exactly 240 visible pieces of what would be a four-dimensional version of the Rubik's Revenge — a Rubik's Cube. A Rubik's Revenge in three dimensions has 56 (64 – 8) visible ...
Flight levels [3] are described by a number, which is the nominal altitude, or pressure altitude, in hundreds of feet, and a multiple of 500 ft.Therefore, a pressure altitude of 32,000 ft (9,800 m) is referred to as "flight level 320".
159.81–160.2 are railroads in Canada only and are used by trucking companies in the U.S. 160.6–162 Wireless microphones and TV/FM broadcast remote pickup; 162.4–162.55: NOAA Weather Stations, narrowband FM, Weatheradio Canada Stations; 174–240 MHz, known as "Band III" internationally. A number of DTV channels have begun broadcasting ...
d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n
157 is: . the 37th prime number.The next prime is 163 and the previous prime is 151. a balanced prime, because the arithmetic mean of those primes yields 157.; an emirp.; a Chen prime.
165 is: . an odd number, a composite number, and a deficient number.; a sphenic number.; a tetrahedral number. [1]the number of prime knots with 10 crossings. [2]the sum of the sums of the divisors of the first 14 positive integers.
63 is a Mersenne number of the form with an of , [5] however this does not yield a Mersenne prime, as 63 is the forty-fourth composite number. [6] It is the only number in the Mersenne sequence whose prime factors are each factors of at least one previous element of the sequence ( 3 and 7 , respectively the first and second Mersenne primes). [ 7 ]