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  2. 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).

  3. Practical number - Wikipedia

    en.wikipedia.org/wiki/Practical_number

    Demonstration of the practicality of the number 12. In number theory, a practical number or panarithmic number [1] is a positive integer such that all smaller positive integers can be represented as sums of distinct divisors of .

  4. Aliquot sum - Wikipedia

    en.wikipedia.org/wiki/Aliquot_sum

    In number theory, the aliquot sum s(n) of a positive integer n is the sum of all proper divisors of n, that is, all divisors of n other than n itself. That is, = |,. It can be used to characterize the prime numbers, perfect numbers, sociable numbers, deficient numbers, abundant numbers, and untouchable numbers, and to define the aliquot sequence of a number.

  5. Deficient number - Wikipedia

    en.wikipedia.org/wiki/Deficient_number

    In number theory, a deficient number or defective number is a positive integer n for which the sum of divisors of n is less than 2n. Equivalently, it is a number for which the sum of proper divisors (or aliquot sum) is less than n. For example, the proper divisors of 8 are 1, 2, and 4, and their sum is less than 8, so 8 is deficient.

  6. 2520 (number) - Wikipedia

    en.wikipedia.org/wiki/2520_(number)

    the last highly composite number that is a divisor of all following highly composite numbers. [5] palindromic in undecimal (1991 11) and a repdigit in bases 55, 59, and 62. a Harshad number in all bases between binary and hexadecimal. the aliquot sum of 1080. part of the 53-aliquot tree.

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  8. Primality test - Wikipedia

    en.wikipedia.org/wiki/Primality_test

    For example, consider the number 100, whose divisors are these numbers: 1, 2, 4, 5, 10, 20, 25, 50, 100. When all possible divisors up to are tested, some divisors will be discovered twice. To observe this, consider the list of divisor pairs of 100:

  9. Are you stretching correctly? Fitness experts break down what ...

    www.aol.com/type-stretch-best-workout-130042087.html

    Researchers have produced conflicting results when it comes to the best pre-workout stretch. For example, a well-cited August 2003 study showed evidence of static stretching for warm-ups worsening ...