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  2. I-20 (form) - Wikipedia

    en.wikipedia.org/wiki/I-20_(form)

    The Form I-20 (also known as the Certificate of Eligibility for Nonimmigrant (F-1) Student Status-For Academic and Language Students) is a United States Department of Homeland Security, specifically ICE and the Student and Exchange Visitor Program (SEVP), document issued by SEVP-certified schools (colleges, universities, and vocational schools) that provides supporting information on a student ...

  3. Universal Numbering System - Wikipedia

    en.wikipedia.org/wiki/Universal_Numbering_System

    Universal Numbering System. Universal numbering system. This is a dental practitioner view, so tooth number 1, the rear upper tooth on the patient's right, appears on the left of the chart. The Universal Numbering System, sometimes called the "American System", is a dental notation system commonly used in the United States. [1] [2]

  4. Pronic number - Wikipedia

    en.wikipedia.org/wiki/Pronic_number

    A pronic number is a number that is the product of two consecutive integers, that is, a number of the form . [1] The study of these numbers dates back to Aristotle. They are also called oblong numbers, heteromecic numbers, [2] or rectangular numbers; [3] however, the term "rectangular number" has also been applied to the composite numbers.

  5. Amicable numbers - Wikipedia

    en.wikipedia.org/wiki/Amicable_numbers

    Amicable numbers are two different natural numbers related in such a way that the sum of the proper divisors of each is equal to the other number. That is, s ( a )= b and s ( b )= a, where s ( n )=σ ( n )- n is equal to the sum of positive divisors of n except n itself (see also divisor function ). The smallest pair of amicable numbers is ...

  6. 20 (number) - Wikipedia

    en.wikipedia.org/wiki/20_(number)

    Twenty is a pronic number, as it is the product of consecutive integers, namely 4 and 5. [3] It is the third composite number to be the product of a squared prime and a prime (and also the second member of the 22 × q family in this form). It has an aliquot sum of 22; a semiprime, within an aliquot sequence of four composite numbers (20, 22, 14 ...

  7. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

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