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There are 21 prime numbers with 2 digits. There are a total of 21 prime numbers between 100 and 200. 21 is the first Blum integer, since it is a semiprime with both its prime factors being Gaussian primes. [4] While 21 is the sixth triangular number, [5] it is also the sum of the divisors of the first five positive integers:
m is a divisor of n (also called m divides n, or n is divisible by m) if all prime factors of m have at least the same multiplicity in n. The divisors of n are all products of some or all prime factors of n (including the empty product 1 of no prime factors). The number of divisors can be computed by increasing all multiplicities by 1 and then ...
21 10080 5,2,1,1 9 72 22 ... Any factor of n must have the same or lesser multiplicity in each prime: ...
The first thousand values of φ(n).The points on the top line represent φ(p) when p is a prime number, which is p − 1. [1]In number theory, Euler's totient function counts the positive integers up to a given integer n that are relatively prime to n.
In mathematics, a divisor of an integer , also called a factor of , is an integer that may be multiplied by some integer to produce . [1 ... 14, 21, 42. The set of ...
The current average rate for a 30-year fixed mortgage is 6.66% for purchase and 6.68% for refinance — down 18 basis points from 6.84% for purchase and 21 basis points from 6.89% for refinance ...
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). 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.
Rates on a 15-year mortgage stand at an average 6.21% for purchase and 6.20% for refinance — down 5 basis points from 6.26% for purchase and 9 basis point from 6.29% for refinance this time last ...