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(another Prime Pages' Curiosity)
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+ The sum of all 3-digit 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 non-toxic 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 n-digit Narcissistic numbers (n=3, 153+370+371+407=1301). [Loungrides]

+ The smallest quintan emirp, i.e., an emirp of form (x^5-y^5)/(x-y) 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 zero-one (13:01) is the smallest prime on a 24-hour clock, in hours and minutes, that is displayed as a different prime on a 12-hour 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]

(There is one curio for this number that has not yet been approved by an editor.)

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