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The Magical Number Seven, Plus or Minus Two. " The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing Information " [1] is one of the most highly cited papers in psychology. [2] [3] [4] It was written by the cognitive psychologist George A. Miller of Harvard University 's Department of Psychology and published ...
A power of two is a number of the form 2n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent . Powers of two with non-negative exponents are integers: 20 = 1, 21 = 2, and 2n is two multiplied by itself n times.
112 -> 11 − (2×2) = 11 − 4 = 7 YES 98 -> 9 − (8×2) = 9 − 16 = −7 YES 634 -> 63 − (4×2) = 63 − 8 = 55 NO Because 1001 is divisible by seven, an interesting pattern develops for repeating sets of 1, 2, or 3 digits that form 6-digit numbers (leading zeros are allowed) in that all such numbers are divisible by seven.
The 7.63×25mm Mauser (.30 Mauser Automatic) round is a bottleneck, rimless, centerfire cartridge, originally developed for the Mauser C96 service pistol. This cartridge headspaces on the shoulder of the case. It later served as the basis for the 7.62mm Tokarev cartridge commonly used in Soviet and Eastern Bloc weapons.
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63 is the sum of the first six powers of 2 (2 0 + 2 1 + ... 2 5). It is the eighth highly cototient number, and the fourth centered octahedral number after 7 and 25. For five unlabeled elements, there are 63 posets.
The 7.62 mm caliber is a nominal caliber used for a number of different cartridges. Historically, this class of cartridge was commonly known as .30 caliber, the equivalent in Imperial and United States Customary measures. It is most commonly used in hunting cartridges.
An n × n square array of integers 1, 2, ..., n2 is called: Semi-magic square when its rows and columns sum to give the magic constant. Simple magic square when its rows, columns, and two diagonals sum to give magic constant and no more. They are also known as ordinary magic squares or normal magic squares.
The below table gives a list of firearms that can fire the 7.62×39mm cartridge, first developed and used by the Soviet Union in the late 1940s. The cartridge is widely used due to the worldwide proliferation of Russian SKS and AK-47 pattern rifles, as well as RPD and RPK light machine guns.
7 ( seven) is the natural number following 6 and preceding 8. It is the only prime number preceding a cube . As an early prime number in the series of positive integers, the number seven has greatly symbolic associations in religion, mythology, superstition and philosophy.