Anxiety Disorder Statistics. Anxiety Disorders affect 18.1 percent of adults in the United States (approximately 40 million adults between the ages of 18 to 54).
Perfect square. Perfect square is an element of algebraic structure which is equal to the square of another element. Square number, a perfect square integer.
A square number, also called a perfect square, is a figurate number of the form, where is an integer. The square numbers for, 1, ... are 0, 1, 4, 9, 16, 25, 36, 49, ... (OEIS A000290). A plot of the first few square numbers represented as a sequence of binary bits is shown above.