Friday's the 13th occur in 2017 on..
January 13th & October 13th
13 is a Fibonacci number
A happy number
The third centered square number
There are 13 Archimedean solids, and a standard 'torus' can be sliced
into 13 pieces with 3 plain cuts
There are also 13 different ways for the three fastest horses in a horse race to finish, allowing
for ties, a fact that can be expressed mathematically by 13 being the third 'ordered Bell number'
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