Friday, 13 January 2012

Today is 13 day of the year.
13 is prime.
13 is a happy number.
13 is a Fibonacci number.
13 is a Tribonacci number with the first three numbers of 0, 0, 1.
13 is the smallest emirp.
13 is a member of the primitive, Pythagorean triples (5, 12, 13) and (13, 84, 85).
13 is a lucky number.
13 is the number of ways three competitors can finish a race if there can be ties.
The thirteen ways are:
1<2<3
1<3<2
2<1<3
2<3<1
3<1<2
3<2<1
1=2<3
1<2=3
1=2=3
1=3<2
2<1=3
2=3<1
3<1=2