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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The sum of all 3digit PPDI's in base 10 (153, 370, 371, and 407) is prime. [Rupinski] There are exactly 1301 nonisomorphic trees with thirteen vertices. [Patterson] Bromotrifluoromethane, also known by the trade name Halon 1301, is a colorless, odorless, and nontoxic gas which extinguishes a fire by chemically reacting with the combustion process. It is now known to be environmentally damaging, particularly toward the Earth's protective ozone layer. The smallest emirp p such that 2^p+p^3 is prime. [Loungrides] The smallest quintan emirp, i.e., an emirp of form (x^5y^5)/(xy) for x, y primes, (case x=5, y=2). [Loungrides] The sum of prime factors (with multiplicities) for the middle number in the smallest nontrivial eRAT triple. [Resta] Thirteen zeroone (13:01) is the smallest prime on a 24hour clock, in hours and minutes, that is displayed as a different prime on a 12hour clock (1:01) [Homewood] The smallest Honaker prime for which the difference between it and its prime index (212) is a square (33^2). [Gaydos]
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