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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    A divisibility rule is a shorthand and useful way of determining whether a given ... Take for instance the number 371; Change all occurrences of 7, 8 or 9 into 0, 1 ...

  3. 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 ...

  4. Divisor - Wikipedia

    en.wikipedia.org/wiki/Divisor

    Prime numbers have exactly 2 divisors, and highly composite numbers are in bold. 7 is a divisor of 42 because =, so we can say It can also be said that 42 is divisible by 7, 42 is a multiple of 7, 7 divides 42, or 7 is a factor of 42. The non-trivial divisors of 6 are 2, −2, 3, −3.

  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). If m is a divisor of n, then so is −m. The tables below only ...

  6. Talk:Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Talk:Divisibility_rule

    This rule for 21 will also apply for all numbers 10n+1 where n is an integer. ... for a number you can use the result to test the divisibility for 7, 11 and 13 all in ...

  7. Divisibility sequence - Wikipedia

    en.wikipedia.org/wiki/Divisibility_sequence

    In fact, if and are coprime, then this is a strong divisibility sequence. The Fibonacci numbers F n form a strong divisibility sequence. More generally, any Lucas sequence of the first kind U n (P,Q) is a divisibility sequence. Moreover, it is a strong divisibility sequence when gcd(P,Q) = 1. Elliptic divisibility sequences are another class of ...

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  9. Factorial number system - Wikipedia

    en.wikipedia.org/wiki/Factorial_number_system

    That is, it has a divisibility rule for each number. There is also a non-terminating equivalent for every rational number akin to the fact that in decimal 0.24999... = 0.25 = 1/4 and 0.999... = 1 , etc., which can be created by reducing the final term by 1 and then filling in the remaining infinite number of terms with the highest value ...