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80 is: the sum of Euler's totient function φ( x ) over the first sixteen integers. a semiperfect number , since adding up some subsets of its divisors (e.g., 1 , 4 , 5 , 10 , 20 and 40 ) gives 80.
Between 1954 and 1975 when the airport quickly became one of the busiest airports in the world, it was expanded 4 more times: in 1956, 1960, 1963 (which was handled by the contractor RMK-BRJ [19]), and 1969. [20] By 1972, the terminal grew to 10,800 m 2 (116,000 sq ft) in space [20] with a capacity of 1.5 million passengers a year. [21]
Broadcast Title Eps. Prod. Cast and crew Theme song(s) Genre Notes 1998 Nov [36]Đám cưới đêm mưa (Rainy Night Wedding) 1 HanoiTV's Literature & Art Committee
The 80th parallel north is a circle of latitude that is 80 degrees north of the Earth's equatorial plane, and 10 degrees (690 miles / 1100 kilometers) south of the North Pole, in the Arctic. It crosses the Atlantic Ocean , Europe , Asia , the Arctic Ocean , and North America .
Due to the heavy rain, water levels in major river systems in northern Vietnam, including the Red River and Thái Bình River systems, rose rapidly, causing significant flooding in 20 out of 25 northern provinces from 8 to 15 September. [27] Thao River's upstream section in Lào Cai surpassed the historical flood level of 1971 by 0.27 m (11 in ...
[15] [17] [28] Some restaurants have offered a phở eating challenge, with prizes for finishing as much as 10 pounds (4.5 kg) of phở in one sitting, [79] or have auctioned special versions costing $5,000.
[15] [16] K-17 Woodland Camouflage pattern Vietnam: Former standard-issue camouflage for ground forces. Similar coloration to the K-07, there are also multiple variants for the other branches of the military. [17] [18] Replaced by the K-20 and observed limited usage since 2020s. K-17 Multi-Terrain Camouflage pattern Vietnam
[182] [183] The delta, covering about 40,000 km 2 (15,444 sq mi), is a low-level plain no more than 3 metres (9.8 ft) above sea level at any point. It is criss-crossed by a maze of rivers and canals, which carry so much sediment that the delta advances 60 to 80 metres (196.9 to 262.5 ft) into the sea every year.