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Te 1 = T 1 = 1 Te 3 = T 4 = 10 Te 8 = T 15 = 120 Te 20 = T 55 = 1540 Te 34 = T 119 = 7140. Te n is the sum of all products p × q where (p, q) are ordered pairs and p + q = n + 1; Te n is the number of (n + 2)-bit numbers that contain two runs of 1's in their binary expansion.
Tetrahedral numbers T(n) 0, 1, 4, 10, 20, 35, 56, 84, 120, 165, ... T(n) is the sum of the first n triangular numbers, with T(0) = 0 (empty sum). A000292:
Decimal: The standard Hindu–Arabic numeral system using base ten.; Binary: The base-two numeral system used by computers, with digits 0 and 1.; Ternary: The base-three numeral system with 0, 1, and 2 as digits.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
Alternatively, and for greater numbers, one may say for 1 ⁄ 2 "one over two", for 5 ⁄ 8 "five over eight", and so on. This "over" form is also widely used in mathematics. Fractions together with an integer are read as follows: 1 + 1 ⁄ 2 is "one and a half" 6 + 1 ⁄ 4 is "six and a quarter" 7 + 5 ⁄ 8 is "seven and five eighths"
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The Natural Area Code, this is the smallest base such that all of 1 / 2 to 1 / 6 terminate, a number n is a regular number if and only if 1 / n terminates in base 30. 32: Duotrigesimal: Found in the Ngiti language. 33: Use of letters (except I, O, Q) with digits in vehicle registration plates of Hong Kong. 34
Roughly 18.4 million Americans with Social Security numbers in a master database had not received benefits or reported income for 50 years, meaning they were likely dead, per a 2023 audit.