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  2. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    The basic rule for divisibility by 4 is that if the number formed by the last two digits in a number is divisible by 4, the original number is divisible by 4; [2] [3] this is because 100 is divisible by 4 and so adding hundreds, thousands, etc. is simply adding another number that is divisible by 4. If any number ends in a two digit number that ...

  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. 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 prime factors - Wikipedia

    en.wikipedia.org/wiki/Table_of_prime_factors

    A factorial x! is the product of all numbers from 1 to x. The first: 1, 2, 6, 24, 120, 720, 5040 ... or n is divisible by m) if all prime factors of m have at least ...

  6. Harshad number - Wikipedia

    en.wikipedia.org/wiki/Harshad_number

    For example, 99 is not a harshad number, since 9 + 9 = 18, and 99 is not divisible by 18. The base number (and furthermore, its powers) will always be a harshad number in its own base, since it will be represented as "10" and 1 + 0 = 1. All numbers whose base b digit sum divides b−1 are harshad numbers in base b.

  7. Division lattice - Wikipedia

    en.wikipedia.org/wiki/Division_lattice

    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.

  8. Senary - Wikipedia

    en.wikipedia.org/wiki/Senary

    A number is divisible by 4 if its penultimate digit is odd and its final digit is 2, or its penultimate digit is even and its final digit is 0 or 4. A number is divisible by 5 if the sum of its senary digits is divisible by 5 (the equivalent of casting out nines in decimal). If a number is divisible by 6, then the final digit of that number is 0.

  9. Amicable numbers - Wikipedia

    en.wikipedia.org/wiki/Amicable_numbers

    Sociable numbers are the numbers in cyclic lists of numbers (with a length greater than 2) where each number is the sum of the proper divisors of the preceding number. For example, 1264460 ↦ 1547860 ↦ 1727636 ↦ 1305184 ↦ 1264460 ↦ … {\displaystyle 1264460\mapsto 1547860\mapsto 1727636\mapsto 1305184\mapsto 1264460\mapsto \dots } are ...

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