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  2. Normal number - Wikipedia

    en.wikipedia.org/wiki/Normal_number

    We say that x is simply normal in base b if the sequence S x, b is simply normal [5] and that x is normal in base b if the sequence S x, b is normal. [6] The number x is called a normal number (or sometimes an absolutely normal number) if it is normal in base b for every integer b greater than 1. [7] [8]

  3. Square (algebra) - Wikipedia

    en.wikipedia.org/wiki/Square_(algebra)

    55, or 5 2 (5 squared), can be shown graphically using a square. Each block represents one unit, 1⋅1, and the entire square represents 55, or the area of the square. In mathematics, a square is the result of multiplying a number by itself. The verb "to square" is used to denote this operation.

  4. Heptadecagon - Wikipedia

    en.wikipedia.org/wiki/Heptadecagon

    Publication by C. F. Gauss in Intelligenzblatt der allgemeinen Literatur-Zeitung. As 17 is a Fermat prime, the regular heptadecagon is a constructible polygon (that is, one that can be constructed using a compass and unmarked straightedge): this was shown by Carl Friedrich Gauss in 1796 at the age of 19. [1]

  5. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    110 ÷ 5 = 22 (The result is the same as the original number divided by 5) If the last digit is 5. 85 (The original number) 8 5 (Take the last digit of the number, and check if it is 0 or 5) 8 5 (If it is 5, take the remaining digits, discarding the last) 8 × 2 = 16 (Multiply the result by 2) 16 + 1 = 17 (Add 1 to the result)

  6. Order of magnitude - Wikipedia

    en.wikipedia.org/wiki/Order_of_magnitude

    Thus, a level being 5 magnitudes brighter than another indicates that it is a factor of () = times brighter: that is, two base 10 orders of magnitude. This series of magnitudes forms a logarithmic scale with a base of 100 5 {\displaystyle {\sqrt[{5}]{100}}} .

  7. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    Every prime number p divides a Fibonacci number that can be determined by the value of p modulo 5. If p is congruent to 1 or 4 modulo 5, then p divides F p−1, and if p is congruent to 2 or 3 modulo 5, then, p divides F p+1. The remaining case is that p = 5, and in this case p divides F p.

  8. Square mile - Wikipedia

    en.wikipedia.org/wiki/Square_mile

    Square miles should not be confused with miles square, a square region with each side having a length of the value given. For example, a region which is 20 miles square (20 miles × 20 miles) has an area of 400 sq mi; a rectangle of measuring 10 miles × 40 miles also has an area of 400 sq mi, but is not 20 miles square.

  9. Candela per square metre - Wikipedia

    en.wikipedia.org/wiki/Candela_per_square_metre

    The candela per square metre (symbol: cd/m 2) is the unit of luminance in the International System of Units (SI). The unit is based on the candela, the SI unit of luminous intensity, and the square metre, the SI unit of area.