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The greatest common divisor (GCD) of integers a and b, at least one of which is nonzero, is the greatest positive integer d such that d is a divisor of both a and b; that is, there are integers e and f such that a = de and b = df, and d is the largest such integer.
An economical number has been defined as a frugal number, but also as a number that is either frugal or equidigital. gcd( m , n ) ( greatest common divisor of m and n ) is the product of all prime factors which are both in m and n (with the smallest multiplicity for m and n ).
a superior highly composite number has a ratio between its number of divisors and itself raised to some positive ... 8, 10, 16, 20, 32, 40, 64, 80, 160, 320 14 762 ...
The Euclidean algorithm is based on the principle that the greatest common divisor of two numbers does not change if the larger number is replaced by its difference with the smaller number. For example, 21 is the GCD of 252 and 105 (as 252 = 21 × 12 and 105 = 21 × 5) , and the same number 21 is also the GCD of 105 and 252 − 105 = 147 .
8 November 2022 4,658,143 59 93839×2 15337656 – 1 28 November 2022 4,617,100 60 2 15317227 +2 7658614 + 1 31 July 2020 4,610,945 61 13×2 15294536 + 1 30 September 2023 4,604,116 62 6×5 6546983 + 1 13 June 2020 4,576,146 63 4788920×3 9577840 – 1 14 February 2024 4,569,798 64 31×2 15145093 – 1 9 February 2025 4,559,129 65 69×2 ...
Consequently, any prime number that divides a does not divide b, and vice versa. This is equivalent to their greatest common divisor (GCD) being 1. [2] One says also a is prime to b or a is coprime with b. The numbers 8 and 9 are coprime, despite the fact that neither—considered individually—is a prime number, since 1 is their only common ...
For example, 15 is a composite number because 15 = 3 · 5, but 7 is a prime number because it cannot be decomposed in this way. If one of the factors is composite, it can in turn be written as a product of smaller factors, for example 60 = 3 · 20 = 3 · (5 · 4) .
The number 4,294,967,295 is a whole number equal to 2 32 − 1. It is a perfect totient number, meaning it is equal to the sum of its iterated totients. [1] [2] It follows 4,294,967,294 and precedes 4,294,967,296. It has a factorization of .