1999

This number is a prime.

+ The least prime number such that the sum of its digits is a perfect number.

+ 1999 = 211 - 72. Note that any positive integer n that obeys the relationship n11 - 7n is called a "convenience store number." [Pomerance]

+ The first megaprime was discovered in 1999. [Doyle]

+ The adventures of the TV show Space: 1999 begin when the Moon is hurled out of Earth's orbit, into deep space.

+ The smallest penultimate year of a millennium that is prime. [Astle]

+ The smallest invertible prime that yields another invertible prime when each digit d is repeated d times: 1999999999999999999999999999. [Beedassy]

+ 1999 was the last time a blue moon appeared twice, in January and March.

+ CafePress was founded as a privately owned company in 1999 by Fred Durham and Maheesh Jain.

+ Prime Numbers Technology is led by Rock Blanco, who sold iBank Travel Management in 1999.

+ John Nash won the Leroy P. Steele Prize in 1999. [Crouse]

+ The site "Prime Curios!" was established in 1999. [Gudipati]

+ La Symphonie Primordiale (1999) is a single movement work for orchestra. The title is something of a play on words, 'symphonie' taking up Stravinsky's 'sounding together of instruments' in his Symphonies of Wind, but here relating to a series of primordial (prime) numbers: the sounding together of prime numbers.

+ Fibonacci numbers mod 1999 are the Pisano period of the beast. [Hasler]

+ The smallest invertible prime p such that mean of the squares of integer digits of p, i.e., ((1+81+81+81)/4)=61, is also an invertible prime. [Bajpai]

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

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