 Rashad Khalifa discovered an intricate numerical pattern in the text of the Qur'an involving the number 19.
In his August 1941 Afterward to Thomas Wolfe's book The Hills Beyond, NY, Wolfe's editor, Edward C. Aswell, remarks that Thomas Wolfe's second book, never published, was to have been K19, a train. When Wolfe died, Aswell watched the train carrying his coffin go by: Train K19! [Haga]
The smallest prime that is equal to the product of its digits plus the sum of its digits. [Russo]
The centerpiece of Bah' community life is the 19-Day Feast. The Bah' calendar
is made up of 19 months of 19 days each. Note that the period of Ayyam-i-Ha (Intercalary Days) adjust the
Bah' year to the solar cycle. []
19 is the smallest prime p such that 10*p {+ 1, 3, 7, and 9} are all primes. [Das]
19 is the smallest prime such that p and p2 have the same digit sum.
The recurring decimal cycles for 1/19 to (19 - 1)/19 form a true magic square.
The R-value of standard attic ceiling is 19.
Blaise Pascal deduced 19 theorems related to his famous triangle.
19 ones form a repunit prime.
1111 x 11111 + 111111111 + 1 (19 ones) is prime. [Fougeron]
St. John's Lane (a street in Rome) is only 19 inches wide.
The smallest prime Keith number, i.e., if the digits of 19 start a Fibonacci-like sequence, then 19 appears as a term (1, 9, 10, 19).
The number of trailing 0s in 80!
Amendment 19 to the United States Constitution gave women the right
to vote. [Filler]
19 European nations endorsed the first international ban on human cloning.
21 + 32 + 53 + 74 + 115 + 136 + 177 + 198 is prime.
Product 19 is a multi-vitamin and mineral cereal of toasted corn, oats, wheat and rice.
The Rhind Papyrus contained a problem to find x so that x plus one seventh of it will equal the prime number 19.
An idiot is someone with an intelligence quotient (I.Q.) less than or equal to 19. [Brenner]
19 = 8 + 2 + 8 + 1 and its reversal equals the square root of 8281.
Pont du Gard aqueduct in Southern France was built in 19 B.C.E. [Feather]
19th Nervous Breakdown was a hit song for the Rolling Stones.
19 = 4! - 3! + 2! - 1!.
In golf, the clubhouse bar is referred to as the 19th Hole.
195 + 192 + 191 + 193 +
195 + 196 + 194 + 190 =
52135640. [De Geest]
A gene on Chromosome 19 has been linked to Alzheimer's disease.
In the game of Go, which originated in China more than four thousand years ago, two players alternate in placing black and white stones on a large 19 x 19 line ruled board, with the aim of surrounding territory.
Checkmate in a King + Opposite Colored Bishops vs. King endgame
requires, at most, 19 moves.
For k = 1, 2, 3, ... 19 at least one of the integers of the
form 6k + 1 or 6k - 1 is prime. [Crespi de Valldaura]
The half-life of Oxygen-19 is only 19 seconds. [Bishop]
19 divides its following consecutive concatenated composite numbers (202122). [De Geest]
The largest prime on the Ishango bone (curiously located on the 19th floor of the Royal Institute for Natural Sciences of Belgium, in Brussels).
Paul Erdös is said to have lived on coffee, doing mathematics 19 hours a day.
If we pretend  = 60/19, then a radius of 57 gives a circumference of exactly 360. [Moody]
The Sun is numbered with 19 in Tarot cards.
The Metonic cycle, which involves the phase cycle of the moon, is a period of about 19 Julian years. [Gevisier]
19 is the largest prime that can be expressed pandigitally in some base b > 1 (19 = 201 in base 3). [Keith]
(1919 - 219)/(19 - 2) is prime. [Luhn]
Waring conjectured in 1770 that every positive integer can be expressed as a sum of 19 biquadrates (fourth powers). This was later proven by
Balasubramanian, Deshouillers and Dress.
Scores of people once died from the Anthrax bacterium following an accident at "Compound 19," a Soviet military facility in the city of Sverdlovsk, now called Yekaterinburg.
19 times its reversal is the famous Hardy-Ramanujan number. [Murthy]
19 is the smallest prime which is the sum of three discrete primes (3 + 5 + 11). [Mander]
Flight 19 disappeared in the Bermuda Triangle. [Leonard]
The Statue of Liberty's torch shines through leaded glass, illuminated by 19 lamps. [Pitkin]
Osama bin Laden has 19 brothers. [NBC News]
19 is the first prime resulting from the sum of cubes of distinct fractions using only primes, i.e., 19 = (5/2)3 + (3/2)3. [Gevisier]
In ancient Sweden the dates of the full moon were computed by runic calendar sticks (runstavar) with the full moon marked only at 19 fixed dates within each month.
[Haga]
Every 19 years, the intercalary month of Chinese Calendar is inserted after the eighth month and is called ren ba yue: Double August. It predicts tragedy and death in popular tradition. [Gevisier]
The composer Béla Bartók finished his Opus 19 in 1919, when he was 38 (twice 19) years old; the title in his native Hungarian
(A csodálatos mandarin) has 19 letters. [Ace]
Steely Dan had a hit song called "Hey Nineteen."
A chess machine (nicknamed "the Turk") once sent Napoleon Bonaparte into a fury by beating him in 19 moves. [Hsu]
Inserting seventeen zeros between the two digits of 19 makes another prime of exactly 19 digits. Note that seventeen and 19 are Twin primes. [De Geest]
String of the first ten odd integers, from 1 up to 19, is prime (135791113151719). [De Geest]
North Dakota once had a 19-story State Capitol. [Bergane]
Hangeul (the Korean alphabet) has 19 consonants. [Poo Sung]
19 is the smallest prime whose reversal is composite. [Gupta]
The smallest prime using/ending in a composite digit. [Murthy]
The smallest number (coincidentally prime) with a additive persistence of 2. [Gupta]
The only prime which is equal to the difference of two prime cubes. [Gupta]
The decimal expansion of 1919 begins with the digits 19. (This is not true for pp where p is any other prime less than 10000019.) [Caldwell]
It is impossible to score 19 points in one hand in the game of cribbage (the lowest of several impossible scores). Hence, the expression "To score 19" means to score zero. [Cary]
The Vice-President of the United States rates a 19-gun salute. [Dobb]
Freud was 19 years older than Jung.
(2^19-1)/(2-1) and (2^19+1)/(2+1) are both primes. [Dobb]
Earth's mass (5.9736 * 1024) and volume (1.083*1012) are both multiples of 19. Earth's volume is in fact a multiple of 192.
The first prime number presenting & meaning the same value within the "western" world and the "arabic" is the number 19. All other recognizable prime numbers are with the combination of a 1 and a 9. [ThaCoDa]
The speed limit (in miles per hour) on the private roads of the Cambourne development near Cambridge, England. [Croll]
The 19th Fibonacci number is the smallest F(P) which is composite where P is itself prime. [Rupinski]
The only number or prime for which there is no palindrome with a digit sum n and beginning with n. [Murthy]
19 is the |1-9|th prime number. [Caldwell]
19 people had been hanged by the time the Salem witch hysteria died down in 1692. [La Haye]
The average age of the United States soldiers serving during the Vietnam War was 19.
19 is the smallest two-digit number such that 19^19+19-1 is prime. [Opao]
The sum of 19 consecutive Fibonacci numbers starting from the 19th Fibonacci number is prime. [Opao]
There are exactly 19 primes beginning with the digit 2 among primes smaller than one thousand. [Capelle]
19^19 - 2 is prime. Note that it starts with the digits 19. [Patterson]
192 = 361 and 3*6+1 = 19. [Madras]
19 is the largest prime factor of 1444 - the smallest perfect square to end in three 4's. Note that 4 is the only non-zero digit that can repeat at the end of a perfect square, and the most consecutive 4's that can appear in such a place is three. [Litman]
The smallest two-digit prime with a prime ASCII code: 3139 (in base 16) = 12601. [Necula]
19^19 + 19 - 1 is prime (with prime digital sum). Note that it starts with the digits 19. [Patterson]
19 divides the concatenation of the integers from 19 down to 1. [De Geest]
Professor Barabási and his team has found that the WWW, on average, has 19 clicks of separation between webpages. [McAlee]
Article 19 of the Universal Declaration of Human Rights:
"Everyone has the right to the freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers." [McAlee]
2^19 - 19 is prime. [Schlesinger]
The smallest prime p such that p^p is pandigital. [Patterson]
19 is the smallest super-2 number (curiously prime), i.e., an integer n such that 2n^2 contains 2 consecutive 2s in its decimal representation. [De Geest]
The largest value of n less than a thousand, such that 2n+3n+5n+7n is prime. [Opao]
19 is the smallest prime equal to the product of Twin primes plus their arithmetic mean (3*5 + 4 = 19). [Teofilatto]
Paul Hardcastle had a hit song called "19." [Wolfe]
19 is only number m such that length(m^prime(m)) = m + prime(m). [Firoozbakht]
The second (and last) trip of the USS Absaroka across the Atlantic to European waters ended in New York in February 1919. On December 24, 1941, the Japanese submarine I-19 fired two torpedoes at that same ship, which was carrying a cargo of lumber, two miles off Pt. Fermin (San Pedro, California). The ship didn't sink but one sailor was killed by falling lumber. [Haga]
19 is the smallest prime of the form 3p + 2q, where p and q are Twin primes. [Teofilatto]
19 is the smallest prime with a digital root of 1. [McAlee]
Any number that is divisible by 19 will have this property: multiply the last digit by 2, then add that number to the remaining digits and the resulting number will be divisible by 19. E.g., 625632 is divisisble by 19 because all of following results are divisible by 19:(62563 + 4 = 62567); (6256 + 14 = 6270); (627 + 0 = 627); (62 + 14 = 76); (7 + 12 = 19); (1 + 18 = 19). [Beedle]
19 is the smallest prime which when turned upside down yields a different prime, i.e., 61. [Astle]
19 is the only prime p less than 30 that does not divide 30, where p + 30 is composite. [Axoy]
19 is the only known number for which both (10^n-1)/9 and (10^n+1)/11 are primes.
19^(9+1) - (9-1) is a prime with prime digits. [Losnak]
19 + 18 + ... + 1 + 0 = 190. [(19) = 1 + 9. 19 is the only prime
with this property. [Firoozbakht]
Football legend Johnny Unitas wore jersey number 19. [Hutchins]
Consider a square made of four rigid rods, hinged at the
ends. How many rods of the same type must be added to make
the square rigid in the plane? The answer is 19, which
makes a total of 23 rods (also prime). [McCranie]
Here is the mathematical code to determine if a number is
divisible by 19. Multiply everything in front of the last
digit by Nine and subtract the last digit. If you get zero,
nineteen, or a multiple of nineteen, the number will be
divisble by 19. For example 57. Five times nine minus seven
equals 38. Since 19 divides evenly into 38, it divides
evenly into 57. Next example 114. Eleven times nine minus
four equals 95. Since 19 divides evenly into 95, it divides
evenly into 114. [Young]
19 is the smallest prime mentioned a prime number of times in the Bible (KJV). [Opao]
The smallest multi-digit number (coincidentally prime) that does not form a palindrome when added to its reversal. [Capelle]
The only two-digit prime n such that n!/reversal(n)+1 and
n!/reversal(n)-1 are both prime. [Patterson]
The prime rate published in the Wall Street Journal was
19.00 for over a month in 1980 and 1981. This remains the highest prime-numbered prime rate ever published. [Goelz]
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