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199 (another Prime Pages' Curiosity) |
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will be down at times on those day (and possibly the next). (caldwell@utm.edu) A prime Lucas number. Adding it to 210n provides the smallest 8, 9, and 10 primes in arithmetic progression. (2199 + 1)/3 is the largest known Wagstaff prime which does not contain all of the individual digits. [Luhn] 199 sets a record low of the Mertens function. A permutable prime, meaning that 919 and 991 are primes as well. [Trotter] The smallest number with an additive persistence of 3. [Gupta] The smallest prime that can be concatenated with the next prime in any order giving two primes: 199211 and 211199. [Gallardo] The Cape May Lighthouse in New Jersey has 199 steps in the tower's cast iron spiral staircase. [McCranie] The smallest invertible emirp. [Punches] In the Goldie Hawn/Chevy Chase movie Foul Play, Ferguson is kidnapped and held at building number 199. The smallest prime which is the sum of the squares of four distinct primes. [Sladcik] The X-15 aircraft made 199 flights. [McCranie] 199Hg (Mercury-199) is the heaviest stable atom which has a prime atomic weight. [Hartley] The half-life of Au-199 is approximately 3.14 days.
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