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2. Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Divisibility_rule

   We also have the rule that 10 x + y is divisible iff x + 4 y is divisible by 13. For example, to test the divisibility of 1761 by 13 we can reduce this to the divisibility of 461 by the first rule. Using the second rule, this reduces to the divisibility of 50, and doing that again yields 5. So, 1761 is not divisible by 13.

3. 1001 (number) - Wikipedia

   en.wikipedia.org/wiki/1001_(number)

   Two properties of 1001 are the basis of a divisibility test for 7, 11 and 13. The method is along the same lines as the divisibility rule for 11 using the property 10 ≡ -1 (mod 11). The two properties of 1001 are 1001 = 7 × 11 × 13 in prime factors 10 3 ≡ -1 (mod 1001) The method simultaneously tests for divisibility by any of the factors ...

4. Divisor - Wikipedia

   en.wikipedia.org/wiki/Divisor

   For example, there are six divisors of 4; they are 1, 2, 4, −1, −2, and −4, but only the positive ones (1, 2, and 4) would usually be mentioned. 1 and −1 divide (are divisors of) every integer. Every integer (and its negation) is a divisor of itself. Integers divisible by 2 are called even, and integers not divisible by 2 are called odd.

5. Table of divisors - Wikipedia

   en.wikipedia.org/wiki/Table_of_divisors

   The tables below list all of the divisors of the numbers 1 to 1000. A divisor of an integer n is an integer m , for which n / m is again an integer (which is necessarily also a divisor of n ). For example, 3 is a divisor of 21, since 21/7 = 3 (and therefore 7 is also a divisor of 21).

6. Division lattice - Wikipedia

   en.wikipedia.org/wiki/Division_lattice

   [1] The prime numbers are precisely the atoms of the division lattice, namely those natural numbers divisible only by themselves and 1. [2] For any square-free number n, its divisors form a Boolean algebra that is a sublattice of the division lattice. The elements of this sublattice are representable as the subsets of the set of prime factors ...

7. Biden takes departing jab at Trump, says he was a 'genuine ...

   www.aol.com/news/biden-takes-departing-jab-trump...

   President Biden took a departing jab at Trump, saying that what the president-elect did was a "genuine threat to democracy.". Ahead of the anniversary of the Jan. 6, 2021, riot at the U.S. Capitol ...