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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 only prime (emirp) equal to the sum of all the ndigit Narcissistic numbers (n=3, 153+370+371+407=1301). [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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