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  2. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    Download as PDF; Printable version ... a primitive abundant number is an abundant number whose proper divisors are all deficient ... 8: 1, 2, 4, 8 4 15 7 deficient ...

  3. 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.

  4. Néron–Severi group - Wikipedia

    en.wikipedia.org/wiki/Néron–Severi_group

    The elements of finite order are called Severi divisors, and form a finite group which is a birational invariant and whose order is called the Severi number. Geometrically NS( V ) describes the algebraic equivalence classes of divisors on V ; that is, using a stronger, non-linear equivalence relation in place of linear equivalence of divisors ...

  5. 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.

  6. Regular number - Wikipedia

    en.wikipedia.org/wiki/Regular_number

    For instance, consider division by the regular number 54 = 2 1 3 3. 54 is a divisor of 60 3, and 60 3 /54 = 4000, so dividing by 54 in sexagesimal can be accomplished by multiplying by 4000 and shifting three places. In sexagesimal 4000 = 1×3600 + 6×60 + 40×1, or (as listed by Joyce) 1:6:40.

  7. Highly abundant number - Wikipedia

    en.wikipedia.org/wiki/Highly_abundant_number

    In number theory, a highly abundant number is a natural number with the property that the sum of its divisors (including itself) is greater than the sum of the divisors of any smaller natural number. Highly abundant numbers and several similar classes of numbers were first introduced by Pillai ( 1943 ), and early work on the subject was done by ...

  8. 15 (number) - Wikipedia

    en.wikipedia.org/wiki/15_(number)

    M = 15 The 15 perfect matchings of K 6 15 as the difference of two positive squares (in orange).. 15 is: The eighth composite number and the sixth semiprime and the first odd and fourth discrete semiprime; [1] its proper divisors are 1, 3, and 5, so the first of the form (3.q), [2] where q is a higher prime.

  9. Greatest common divisor - Wikipedia

    en.wikipedia.org/wiki/Greatest_common_divisor

    The elements 2 and 1 + √ −3 are two maximal common divisors (that is, any common divisor which is a multiple of 2 is associated to 2, the same holds for 1 + √ −3, but they are not associated, so there is no greatest common divisor of a and b.