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173 (another Prime Pages' Curiosity) |
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173 is a prime of the form F(i)2 + F(j)2, where F(n) are Fibonacci numbers. [Russo] There are 173 stars included in the list near the back of the Nautical Almanac, an annual publication of the U.S. Naval Observatory. 173 x 10173 + (10173 - 1) is prime. [Luhn] Prime in the decimal expansion of square root of 3. [Haga] 2^2 + 13^2 = 173, which is prime. [La Haye] The leading 3 digits in the decimal expansion of sqrt(3) is prime. [Carmody] The destroyer escort USS Eldridge (DE-173) is made invisible and teleported from Philadelphia, Pennsylvania, to Norfolk, Virginia, in an alleged 1943 incident known as the Philadelphia Experiment. [Moore] 173 is a curious prime which occurs twice in the properties of the curious prime 30103, as found by Jud McCranie and G. L. Honaker, Jr., in July 1998. 30103 is the only known multi-digit palindromic prime found by averaging the divisors of a composite number: 30103 = (1 + 5 + 173 + 865 + 29929 + 149645)/6 and 30103 = (1 + 2 + 3 + 6 + 173 + 346 + 519 + 1038 + 29929 + 59858 + 89787 + 179574)/12. 30103 = average of divisors of 149645 and 30103 = average of divisors of 179574. [Post] The smallest prime inconsummate number, i.e., no number is 173 times the sum of its digits. [Conway]
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