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101111 is prime when read as a basetwo number. This is the last of only four primes in the first 10,000 that are both a prime when read as a basetwo and a baseten number. [Connolly]
The smallest prime concatenated from the binary representations of a twin prime pair. 101 (base 2) = 5 (base 10) concatenated with 111 (base 2) = 7 (base 10), with (5,7) the second twin prime pair. [Post]
(There is one curio for this number that has not yet been approved by an editor.)
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