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2. Divisibility rule - Wikipedia

   en.wikipedia.org/wiki/Divisibility_rule

   To test the divisibility of a number by a power of 2 or a power of 5 (2 n or 5 n, in which n is a positive integer), one only need to look at the last n digits of that number. To test divisibility by any number expressed as the product of prime factors p 1 n p 2 m p 3 q {\displaystyle p_{1}^{n}p_{2}^{m}p_{3}^{q}} , we can separately test for ...

3. 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).

4. 1001 (number) - Wikipedia

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

   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 of 1001. First, the digits of the number being tested are grouped in blocks ...

5. List of number theory topics - Wikipedia

   en.wikipedia.org/wiki/List_of_number_theory_topics

   1 Divisibility. 2 Fractions. 3 Modular arithmetic. 4 Arithmetic functions. ... Lucas–Lehmer test for Mersenne numbers; AKS primality test; Integer factorization

6. Division lattice - Wikipedia

   en.wikipedia.org/wiki/Division_lattice

   The non-negative integers partially ordered by divisibility. The division lattice is an infinite complete bounded distributive lattice whose elements are the natural numbers ordered by divisibility. Its least element is 1, which divides all natural numbers, while its greatest element is 0, which is divisible by all natural numbers.

7. 5 Items From the 1970s That Are Worth a Lot of Money - AOL

   www.aol.com/5-items-1970s-worth-lot-170007423.html

   Pong (original Atari Pong C-100, 1972): $100 to $150. Asteroids (original arcade machine, 1979): $1,200.