posters sold by Perfectly Scientific Inc., date
back to June of 1999.
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 is one curio for this number that has not yet been approved by an editor.)