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]
A blue moon appeared twice, in January and March of 1999. [Greggory]
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 website "Prime Curios!" was established in 1999. [Gudipati]
1999 has the same sum of digits as the 1999th Honaker prime
(612113) and its prime index (50018) combined. [Gaydos]
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]
Anthony Madrid worked on prime numbers for a few ecstatic days in the year 1999.
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]
The last total solar eclipse of the 20th century was on August 11, 1999. [Homewood]
COSI (Center of Science and Industry) in Columbus, Ohio, moved from their longtime original location at Memorial Hall to their current location at 333 W. Broad Street, which was previously Central High School, in 1999. [Pennington]