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  2. Composite number - Wikipedia

    en.wikipedia.org/wiki/Composite_number

    [3] [4] E.g., the integer 14 is a composite number because it is the product of the two smaller integers 2 × 7 but the integers 2 and 3 are not because each can only be divided by one and itself. The composite numbers up to 150 are:

  3. 4 - Wikipedia

    en.wikipedia.org/wiki/4

    4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5 . It is a square number , the smallest semiprime and composite number , and is considered unlucky in many East Asian cultures.

  4. Highly composite number - Wikipedia

    en.wikipedia.org/wiki/Highly_composite_number

    For example, 6 is highly composite because d(6)=4 and d(n)=1,2,2,3,2 for n=1,2,3,4,5 respectively. A related concept is that of a largely composite number, a positive integer that has at least as many divisors as all smaller positive integers.

  5. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a product (2 × 2) in which both numbers are smaller than 4.

  6. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

  7. Quaternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Quaternary_numeral_system

    Four is the largest number within the subitizing range and one of two numbers that is both a square and a highly composite number ... (=11 4) Other prime factors: 13 ...

  8. If You Keep Seeing the Number 4 Everywhere, Here's What It ...

    www.aol.com/keep-seeing-number-4-everywhere...

    Now, the number 4 in a series that appears as “444” signifies that there are legends of angels lending assistance, Berry says. “Miracles are happening now.

  9. Semiprime - Wikipedia

    en.wikipedia.org/wiki/Semiprime

    Semiprime numbers have no composite numbers as factors other than themselves. [6] For example, the number 26 is semiprime and its only factors are 1, 2, 13, and 26, of which only 26 is composite.