Square pyramidal number
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High Quality Content by WIKIPEDIA articles! In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents a pyramid with a base and four sides.Pyramid numbers can be modelled in physical space with a given number of balls and a square frame that hold in place the number of balls forming the base, that is, n2. They also solve the problem of counting the number of squares in an n × n grid. In mathematics, a square number, sometimes also called a perfect square, is an integer that can be written as the square of some other integer; in other words, it is the…mehr

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High Quality Content by WIKIPEDIA articles! In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents a pyramid with a base and four sides.Pyramid numbers can be modelled in physical space with a given number of balls and a square frame that hold in place the number of balls forming the base, that is, n2. They also solve the problem of counting the number of squares in an n × n grid. In mathematics, a square number, sometimes also called a perfect square, is an integer that can be written as the square of some other integer; in other words, it is the product of some integer with itself. So, for example, 9 is a square number, since it can be written as 3 × 3. Square numbers are non-negative. Another way of saying that a (non-negative) number is a square number, is that its square root is again an integer. For example, 9 = 3, so 9 is a square number.