|
80 (other)
80 may refer to: * 80 (number) * one of the years 80 BC, AD 80, 1980, 2080 * ''B. B. King & Friends: 80'' * 80 (Tolis Voskopoulos album), ''80'' (Tolis Voskopoulos album), 1980 * Audi 80, a precursor of the Audi A4 automobile * Boeing 80, a late 1920s Boeing aircraft * "80", a song by Green Day from their 1991 album ''Kerplunk (album), Kerplunk!'' See also * * List of highways numbered {{Numberdis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
80 (number)
80 (eighty) is the natural number following 79 and preceding 81. In mathematics 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. * a ménage number. * palindromic in bases 3 (22223), 6 (2126), 9 (889), 15 (5515), 19 (4419) and 39 (2239). * a repdigit in bases 3, 9, 15, 19 and 39. The Pareto principle (also known as the 80-20 rule) states that, for many events, roughly 80% of the effects come from 20% of the causes... Every solvable configuration of the 15 puzzle can be solved in no more than 80 single-tile moves.A. Brüngger, A. Marzetta, K. Fukuda and J. NievergeltThe parallel search bench ZRAM and its applications ''Annals of Operations Research'' 90 (1999), pp. 45–63. In science * The atomic number of mercury In religion * According to Exodus 7:7, Moses was 80 years old when he initially spoke to Pharaoh o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |