## Sunday, February 23, 2014

### 13 Is My Lucky Number

• Ömer Bartu Avci is written with 13 letters and he was born on the 13th.
• To be exact, he was born on July 13. Both 137 and 1307 are prime numbers, just like 13 and 7.
• 13 is a Wilson prime (p2 divides (p − 1)! + 1)
• 13 is the smallest emirp
• 13 is a fibonacci prime. Thus, it is the first fibonacci emirp
• 213 - 13 is prime
• There are 13 Archimedean solids
• The sum of first 13 prime numbers is 238 (whose sum of digits is 13)
• 132 = 169 and its reversal 312 = 961
• 13 is the only prime that can divide two successive integers of the form n2 + 3
• 1313 - 13 + 1 is prime
• The olive branch on the back of a U.S. one-dollar bill has 13 leaves
• 131211109876543212345678910111213 is prime
• 13 is the smallest prime which is the sum of two distinct prime squares (22 + 32)
• Using the first three primes we have: 23 + 5 = 13
• Alfred Hitchcock's directorial debut was the film Number 13, which was never completed
• The sum of primes up to 13 is equal to the 13th prime
• The Beatles recorded 13 albums during the time in which they were together as a group
• Three planes can cut a donut into a maximum of 13 parts
• 132 = 83 - 73, i.e., one solution of the diophantine equation z2 = x3 - y3
• Apollo Lunar Mission number 13, which was aborted while enroute to the Moon because of an explosion of a fuel cell in the service module, left the launch pad at 13:13 (CST) hours military time and the accident occurred on April 13
• At Jesus Christ's last supper, there were thirteen people around the table, counting Christ and the twelve apostles.
• At most 13 baseball players can be in play: 9 fielders, 3 runners, and 1 batter
• In rugby each team has 13 players on the field at a time
• There are 13 cards of each suit in a deck of playing cards
• If we count all the traditional constellations, there are 13 in the zodiac. 13th sign is the Ophiuchus (Serpent-bearer)
• According to Jewish law, when Jewish boys become 13 years old, they become a bar mitzvah