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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]
The system was based on fixed-length numbers; a direct-dial long-distance call consisted of a three-digit area code and a seven-digit local number. Numbers in 2L-4N cities (such as Montréal and Toronto ) were systematically lengthened to seven digits in the 1950s, a few exchanges at a time, so that all local numbers were seven digits when ...
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Wendy's also recently announced a new 2 for $7 deal, allowing customers to choose from 16 different menu combos until March 2. For the 2 for $7 deal, customers can visit Wendy's in person or ...
Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.
Cash 5 July 7 numbers. July 7 Cash 5 numbers were 1-10-17-35-40. Nobody guessed all five numbers for a jackpot of $190,000. Tonight's drawing is worth $242,000. Pick 3 numbers, Pick 4 numbers for ...
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