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In mathematics. 50 as the sum of two non-zero squares. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 1 2 + 7 2 = 5 2 + 5 2 (see image). [1] It is also the sum of three squares, 50 = 3 2 + 4 2 + 5 2, and the sum of four squares, 50 = 6 2 + 3 2 + 2 2 + 1 2. It is a Harshad number.
40 is the smallest number with exactly nine solutions to the equation Euler's totient function (for values 41, 55, 75, 82, 88, 100, 110, 132, and 150 of ). Adding up some subsets of the divisors of 40 (e.g., 1, 4, 5, 10, and 20) gives 40; hence, 40 is the ninth semiperfect number. [6] 40 is also the ninth refactorable number.
90 ( ninety) is the natural number following 89 and preceding 91 . In the English language, the numbers 90 and 19 are often confused, as they sound very similar. When carefully enunciated, they differ in which syllable is stressed: 19 /naɪnˈtiːn/ vs 90 /ˈnaɪnti/. However, in dates such as 1999, and when contrasting numbers in the teens and ...
51 is: The atomic number of antimony. The code for international direct dial phone calls to Peru. The last possible television channel number in the UHF bandplan for American terrestrial television from December 31, 2011, when channels 52–69 were withdrawn, to July 3, 2020, when channels 38–51 were removed from the bandplan.
Forty-nine is the square of the prime number seven and hence the fourth non-unitary square prime of the form p2. 49 has an aliquot sum of 8; itself a prime power, and hence an aliquot sequence of two composite members (49, 8, 7, 1 ,0). It appears in the Padovan sequence, preceded by the terms 21, 28, 37 (it is the sum of the first two of these ...
53 is a sexy prime with 47 and 59. It is the eighth Sophie Germain prime, and the ninth Eisenstein prime. [1] The sum of the first 53 primes is 5830, which is divisible by 53, a property shared by only a few other numbers. [2] [3] 53 cannot be expressed as the sum of any integer and its decimal digits, making 53 the ninth self number in decimal.
501 ( five hundred [and] one) is the natural number following 500 and preceding 502 . 501 is the sum of the first eighteen primes. [1] There are 501 degree-8 polynomials with integer coefficients, all of whose roots are in the unit disk. [2] There are 501 ways of partitioning the digits from 0 to 9 into two sets, each of which contains at least ...
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.