Ancient unit of measurement

Published May 22, 2017 The oldest unit of weight measurement is the Bek of the Amratian period of Egyptian civilization (about 3800 BC), found in Nakade, Egypt. The weights were cylindrical with rounded ends. They weighed from 188,7 to 211,2 g. The builders of the funeral constructions of the megalithic epoch in the north-west of Europe (about 3500 BC) used the ancient unit of length measurement...

The magic square

Published May 22, 2017 The magic square – a square matrix of numbers, which are located in such a way that their sum by diagonally, or in any series always make the same number of horizontal and vertical. In the 7th century the arabs knew the magic square consisting of nine cells. In the 12th century magic square described in his writings of Ibn Ezra...

Pythagorean triangles

Published May 22, 2017 Among the infinite number of possible rectangular triangles, the so-called "Pythagorean triangles", whose sides are integers, always attracted special interest. Undoubtedly, "Pythagorean triangles" belong to the category of "treasures of geometry", and their search is one of the most interesting pages in the history of mathematics...

Perfect numbers

Published May 22, 2017 Perfect numbers are equal to the sum of their divisors that are different from the numbers themselves, for example 1 + 2 + 4 + 7 + 14 = 28. The smallest perfect number: 6 = 1 + 2 + 3. Perfect numbers grow amazingly, say, 6th Is already measured by billions (8589869056). For today, the largest, 31st perfect number (2216091 - 1) * 2216090 is known. It was obtained thanks to the discovery in September...

Fermat's numbers

Published May 22, 2017 It was hypothesized that all Fermat's numbers of this kind are prime numbers. This hypothesis was refuted by Euler in 1732, he found the Fermat's number expansion F5. At the moment, no single Fermat number is known more than F4. It is known that Fn are composite at 5<= n <= 32...

Destiny number

Published May 22, 2017 Some believe that the destiny of a person correlates with a certain number. The easiest way to find out the destiny number is next. Add the date and month of your birth. Add the year of your birth. Add the numbers that make up the resulting number. And here is the destiny number!..

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