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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]
Let be a natural number.For base >, let the function () be the digit sum of in base .A natural number with prime factorization =, is a Smith number if =, (). Here the exponent () is the multiplicity of as a prime factor of (also known as the p-adic valuation of ).
7/1 may refer to: July 1 (month-day date notation) January 7 (day-month date notation) A form of septuple meter; The margin at Brazil v Germany (2014 FIFA World Cup)
Number theory is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions.German mathematician Carl Friedrich Gauss (1777–1855) said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics."
1/7 or 1-7 most commonly refers to 1/7 (number), a fraction (one seventh, 1 ⁄ 7) 1/7 may also refer to: January 7 (month-day date notation) 1 July (day-month date notation) 1st Battalion 7th Marines, an infantry battalion of the 7th Marine Regiment of the United States Marine Corps. 7th Battalion (1st British Columbia), CEF; The margin at ...