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The number of 777 customers had grown to 25 airlines by June 1997, with 323 aircraft on order. On August 26, 2004, Singapore Airlines followed up with a US$4 billion order for the 777-300ER, including 18 firm orders and 13 options. The combined orders would make the carrier's 777 fleet number 77 when deliveries were complete.
Ten is the sum of all products p × q where ( p, q) are ordered pairs and p + q = n + 1. Ten is the number of ( n + 2)-bit numbers that contain two runs of 1's in their binary expansion. The largest tetrahedral number of the form. 2 a + 3 b + 1 {\displaystyle 2^ {a}+3^ {b}+1} for some integers. a {\displaystyle a}
Eulerian number. In combinatorics, the Eulerian number is the number of permutations of the numbers 1 to in which exactly elements are greater than the previous element (permutations with "ascents"). Leonhard Euler investigated them and associated polynomials in his 1755 book Institutiones calculi differentialis.
v. t. e. In particle physics, lepton number (historically also called lepton charge) [1] is a conserved quantum number representing the difference between the number of leptons and the number of antileptons in an elementary particle reaction. [2] Lepton number is an additive quantum number, so its sum is preserved in interactions (as opposed to ...
40 is the smallest number with exactly nine solutions to the equation Euler's totient function (for values 41, 55, 75, 82, 88, 100, 110, 132, and 150 of ). Adding up some subsets of the divisors of 40 (e.g., 1, 4, 5, 10, and 20) gives 40; hence, 40 is the ninth semiperfect number. [6] 40 is also the ninth refactorable number.
Strahler number. In mathematics, the Strahler number or Horton–Strahler number of a mathematical tree is a numerical measure of its branching complexity. These numbers were first developed in hydrology, as a way of measuring the complexity of rivers and streams, by Robert E. Horton ( 1945) and Arthur Newell Strahler ( 1952, 1957 ).
Order No. 227 (Russian: Приказ № 227, romanized: Prikaz No. 227) was an order issued on 28 July 1942 by Joseph Stalin, who was acting as the People's Commissar of Defence. It is known for its line "Not a step back!" (Ни шагу назад!, Ni shagu nazad!), which became the primary slogan of the Soviet press in summer 1942.
Special Order 191. Copy of Lost Order displayed at Crampton's Gap, Maryland. Special Order 191 (series 1862), also known as the " Lost Dispatch " and the " Lost Order ", was a general movement order issued by Confederate Army General Robert E. Lee on about September 9, 1862, during the Maryland Campaign of the American Civil War.