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79 may refer to: * 79 (number) * one of the years 79 BC, AD 79, 1979, 2079 * ''79 A.D.'', a 1962 historical epic film * Eruption of Mount Vesuvius in 79, a catastrophic volcanic eruption in Italy See also * * List of highways numbered {{Numberdis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
79 (number)
79 (seventy-nine) is the natural number following 78 and preceding 80. In mathematics 79 is: * An odd number. * The smallest number that can not be represented as a sum of fewer than 19 fourth powers. * The 22nd prime number (between and ) * An isolated prime without a twin prime, as 77 and 81 are composite. * The smallest prime number ''p'' for which the real quadratic field Q[] has Ideal class group, class number greater than 1 (namely 3). * A cousin prime with 83. * An emirp, because the reverse of 79, 97 (number), 97, is also a prime. * A Fortunate prime. * A circular prime. * A prime number that is also a Gaussian prime (since it is of the form ). * A happy prime. * A Higgs prime. * A lucky prime. * A permutable prime, with ninety-seven. * A Pillai prime, because 23 ! + 1 is divisible by 79, but 79 is not one more than a multiple of 23. * A regular prime. * A right-truncatable prime, because when the last digit (9) is removed, the remaining number (7) is still prime. * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
