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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 ...
Power of two. 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.
545 J (402 ft⋅lbf) 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. [1] It later served as the basis for the 7.62mm Tokarev cartridge commonly used in Soviet and Eastern Bloc weapons.
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.
637: 63 - 7 × 9 = 0. 14: It is divisible by 2 and by 7. 224: it is divisible by 2 and by 7. Add the last two digits to twice the rest. The result must be divisible by 14. 364: 3 × 2 + 64 = 70. 1,764: 17 × 2 + 64 = 98. 15: It is divisible by 3 and by 5. 390: it is divisible by 3 and by 5. 16
Most-perfect magic square when it is a pandiagonal magic square with two further properties (i) each 2×2 subsquare add to 1/k of the magic constant where n = 4k, and (ii) all pairs of integers distant n/2 along any diagonal (major or broken) are complementary (i.e. they sum to n 2 + 1).
From 7 Plus Seven until 63 Up the films were directed by Michael Apted, who had been a researcher on Seven Up! and was involved in finding the original children, with Gordon McDougall. [ citation needed ] The premise of the film was taken from the Jesuit motto "Give me a child until he is seven and I will give you the man".
Copper ( 29 Cu) has two stable isotopes, 63 Cu and 65 Cu, along with 28 radioisotopes. The most stable radioisotope is 67 Cu with a half-life of 61.83 hours. Most of the others have half-lives under a minute. Unstable copper isotopes with atomic masses below 63 tend to undergo β + decay, while isotopes with atomic masses above 65 tend to ...
The 7.63 mm Mannlicher or 7.65 mm Mannlicher is a centerfire rimless pistol cartridge developed for the Steyr Mannlicher M1901 pistol. This military pistol was rejected by the Austrian Ministry of War, but was often carried as a private weapon by officers. The United Kingdom began manufacturing ammunition when the Mannlicher pistol became ...
7 is the only number D for which the equation 2 n − D = x 2 has more than two solutions for n and x natural. In particular, the equation 2 n − 7 = x 2 is known as the Ramanujan–Nagell equation. There are 7 frieze groups in two dimensions, consisting of symmetries of the plane whose group of translations is isomorphic to the group of integers.