Description
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 73 and 83) 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[√p] has class number greater than 1 (namely 3). A cousin prime with 83. An emirp in base 10, because the reverse of 79, 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 4n + 3). A happy prime. A Higgs prime. A lucky prime.
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