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. The website Prime Curios! was launched the same year. [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.
(There are 2 curios for this number that have not yet been approved by an editor.)