The number 1 is not a prime number, but a divider for every natural number. The Eight is the smallest Leyland number. Every odd number greater than one, raised to the square, resulting in a multiple of eight with a remainder of one. It is also the smallest composed of three prime number. Eight is the first real cubic number, if one disregards 1 cube. In computer technology we use a number system on the basis of eight, the octal system. A polygon with eight sides is an octagon. The octahedron is one of the five platonic bodies. Another feature of the four is the impossibility of an algebraic equation of higher degree than four square roots using simple arithmetic and basic operations dissolve.
These then form a tetrahedron (tetrahedron), a body with four identical triangular faces. Space let's us arrange equidistantly a maximum of four points. It is the simplest figure that can be deformed while keeping it's side lengths, such as the rectangle to parallelogram. Four points make the plane of a square, an area with four sides. The peculiarity of the four is that both 2 + 2 = 4 and 2 * 2 = 4 and thus 2^2 = 4. It is the first composite number and thus the first non-prime number after one. Rule of three: If the sum of the digits of a number is a multiple of three, the underlying number is divisible by three. With the calculation of its sizes deals trigonometry. The triangle is the simplest geometric figure in the plane.
It is the fourth number of the Fibonacci sequence and the second one that is unique. At the same time it is the first Mersenne prime (2 ^ 2-1), the first Fermat prime (2 ^ +1), the second Sophie Germain prime and the second Mersenne prime exponent. Three is the first odd prime number and the second smallest right after number two. Learn More About Numbers 3 4 8 1 0 In French
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