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Formerly the area code for the entire Caribbean. According to the National Fraud Information Center, it has been associated with long distance phone scams. The only threedigit circulardigit prime. The hotel room number in the 1952 film Don't Bother to Knock, starring Richard Widmark and Marilyn Monroe. Marilyn's character (Nell Forbes) is a lonely blonde who has recently been released from a mental institution. [McCranie] The smallest prime whose fourth power is zeroless pandigital (i.e., containing all digits from 1 to 9). [Gupta] The largest prime less than 10000 such that 2^{p}F(p) is also prime, where F(p) is the pth Fibonacci number. [Opao] The lesser of the smallest twin prime pair that contain no prime digits. [Punches] The smallest circulardigit Cyclops prime. [Punches] 809 is the start of 21 consecutive primes which alternate between the forms 6n  1 and 6n + 1. The smallest start of 22 such primes is the much larger 3954889. [Andersen] Largest known prime p such that T(p) is prime in Juricevic conjecture on classification of Lehmer triples. Juricevic conjectured an infinite number of such primes. Yu Tsumura proved that T(p) is infinitely often composite. [Post]
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