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The multiplicity of a prime factor p of n is the largest exponent m for which p m divides n. The tables show the multiplicity for each prime factor. If no exponent is written then the multiplicity is 1 (since p = p 1). The multiplicity of a prime which does not divide n may be called 0 or may be considered undefined.
The aliquot sum of 16 is 15, within an aliquot sequence of four composite members (16, 15, 9, 4, 3, 1, 0) that belong to the prime 3-aliquot tree. Sixteen is the largest known integer n, for which + is prime. It is the first Erdős–Woods number. [2] There are 16 partially ordered sets with four unlabeled elements. [3]
While Euclid took the first step on the way to the existence of prime factorization, Kamāl al-Dīn al-Fārisī took the final step [8] and stated for the first time the fundamental theorem of arithmetic. [9] Article 16 of Gauss's Disquisitiones Arithmeticae is an early modern statement and proof employing modular arithmetic. [1]
Continuing this process until every factor is prime is called prime factorization; the result is always unique up to the order of the factors by the prime factorization theorem. To factorize a small integer n using mental or pen-and-paper arithmetic, the simplest method is trial division : checking if the number is divisible by prime numbers 2 ...
The same prime factor may occur more than once; this example has two copies of the prime factor When a prime occurs multiple times, exponentiation can be used to group together multiple copies of the same prime number: for example, in the second way of writing the product above, 5 2 {\displaystyle 5^{2}} denotes the square or second power of ...
Thus 11 is prime, and the prime factorization is; 1386 = 2 · 3 2 · 7 · 11. Expressions ... having 16 multiplications, 4 subtractions and 3 additions, may be ...
The factorizations take the form of an optional unit multiplied by integer powers of Gaussian primes. Note that there are rational primes which are not Gaussian primes. A simple example is the rational prime 5, which is factored as 5=(2+i)(2−i) in the table, and therefore not a Gaussian prime.
For example, 720 (2 4 × 3 2 × 5 1) is 5-smooth but not 5-powersmooth (because there are several prime powers greater than 5, e.g. = and =). It is 16-powersmooth since its greatest prime factor power is 2 4 = 16. The number is also 17-powersmooth, 18-powersmooth, etc.