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  2. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    The converse of the statement above is, however, not always true. For example, the digital root of 12, which is not a triangular number, is 3 and divisible by three. If x is a triangular number, a is an odd square, and b = ⁠ a − 1 / 8 ⁠, then ax + b is also a triangular number.

  3. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    All rational numbers are real, but the converse is not true. Irrational numbers (): Real numbers that are not rational. Imaginary numbers: Numbers that equal the product of a real number and the imaginary unit , where =. The number 0 is both real and imaginary.

  4. Squared triangular number - Wikipedia

    en.wikipedia.org/wiki/Squared_triangular_number

    A square whose side length is a triangular number can be partitioned into squares and half-squares whose areas add to cubes. From Gulley (2010).The n th coloured region shows n squares of dimension n by n (the rectangle is 1 evenly divided square), hence the area of the n th region is n times n × n.

  5. Square triangular number - Wikipedia

    en.wikipedia.org/wiki/Square_triangular_number

    Consequently, a square number is also triangular if and only if + is square, that is, there are numbers and such that =. This is an instance of the Pell equation x 2 − n y 2 = 1 {\displaystyle x^{2}-ny^{2}=1} with n = 8 {\displaystyle n=8} .

  6. Polygonal number - Wikipedia

    en.wikipedia.org/wiki/Polygonal_number

    The triangular number sequence is the representation of the numbers in the form of equilateral triangle arranged in a series or sequence. These numbers are in a sequence of 1, 3, 6, 10, 15, 21, 28, 36, 45, and so on.

  7. Why is housing so expensive? There simply aren't enough homes.

    www.aol.com/why-housing-expensive-simply-arent...

    Not enough home construction There’s a lot more consensus on the reasons for the shortage. The biggest one: After the financial crisis of 2008, homebuilding activity tumbled.

  8. 12 (number) - Wikipedia

    en.wikipedia.org/wiki/12_(number)

    12 (twelve) is the natural number following 11 and preceding 13.. Twelve is the 3rd superior highly composite number, [1] the 3rd colossally abundant number, [2] the 5th highly composite number, and is divisible by the numbers from 1 to 4, and 6, a large number of divisors comparatively.

  9. The face triangle of death and all the potential dangers ...

    www.aol.com/article/lifestyle/2017/01/03/popping...

    As a beauty editor, I pride myself on my extensive skin-care routine. Every day, I spend at least 30 minutes on my regimen, and while I'm dedicated to my laundry list of steps, I'm also 100 ...