Prime Curios!: 1301

1301
(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.

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