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In bases 7 and greater, there is exactly one self-descriptive number: () + + +, which has b−4 instances of the digit 0, two instances of the digit 1, one instance of the digit 2, one instance of digit b – 4, and no instances of any other digits. The following table lists some self-descriptive numbers in a few selected bases:
The use of descriptive and summary statistics has an extensive history and, indeed, the simple tabulation of populations and of economic data was the first way the topic of statistics appeared. More recently, a collection of summarisation techniques has been formulated under the heading of exploratory data analysis : an example of such a ...
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. 7 is one of seven numbers in the positive definite quadratic integer matrix representative of all odd numbers: {1, 3, 5, 7, 11, 15, 33}. [19] [20]
Editor's note: This file captures the news of the California wildfires from Tuesday, Jan. 21. For the latest updates on the LA and San Diego fires, follow USA TODAY's coverage for Wednesday, Jan ...
President Donald Trump is likely to dust off a 1930 trade law largely forgotten for decades to back his new reciprocal U.S. tariffs that will match other countries' higher import taxes, trade and ...
where the solubility product for [Ca 2+][CO 2− 3] is given as anywhere from K sp = 3.7 × 10 −9 to K sp = 8.7 × 10 −9 at 25 °C, depending upon the data source. [ 80 ] [ 81 ] What the equation means is that the product of molar concentration of calcium ions ( moles of dissolved Ca 2+ per liter of solution) with the molar concentration of ...
Defendants Janssen Pharmaceuticals, Inc.; Johnson & Johnson; and Janssen Research & Development, LLC (collectively, “Janssen”), by and through their undersigned ...
Go is an abstract strategy board game for two players in which the aim is to fence off more territory than the opponent. The game was invented in China more than 2,500 years ago and is believed to be the oldest board game continuously played to the present day.