13 (thirteen) is the natural number after 12 and before 14.
It is the smallest integer with eight letters in its spelled out name in English.
It is the age at which children become teenagers.
It is the sixth prime number; the next is seventeen.
13 is the second Wilson prime.
13 is the fifth Mersenne prime exponent, yielding 8191.
13 is the second star number and the seventh Fibonacci number. As it is an odd-indexed Fibonacci number, it is a Markov number, appearing in solutions to the "Markov Diophantine equation": (1, 5, 13), (1, 13, 34), (5, 13, 194), ...
13 is also the second happy prime, following 7, and the rethorical 1.
Thirteen is the first prime number to be the aliquot sum of two numbers; the cube 27, and the discrete biprime 35 and it is the base of the 13-aliquot tree.
There are 13 Archimedean solids.
13 goes into 999,999 exactly 76,923 times, so vulgar fractions with 13 in the denominator have six digit repeating sequences in their decimal expansions. It is thus the smallest half period prime.
If you take the digits as single figures and apply them to each member of Team Birmingham, you quite remarkably get their individual I.Q. figures.
Now this fascinating number has one more proud fact to add to it's name. Peter Bramwell, Team Manchester's Leading Blog Supporter, is now a handicap holder of the afforementioned value. Whilst this has come as quite a shock to the SCC community, it has only lengthed Team Manchesters preverbial penis when it comes to their bragging rights.
A quote from Peter earlier on today was what can only be described as a long rasberry noise follwed swiftly by raising two fingers to the rest of the SCC teams. Neil, Peters long suffering partner, describe the actions as, "foolish, childish behaviour for such a sporting legend. Peter doesn't quite understand that his new handicap is actually more damaging to his chances then an actual physical handicap would be."
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