Bluebulb Projects' The Measure of Things presents:
13 is about one-and-two-fifths times the number of Symphonies Composed by Beethoven.
In other words, it's 1.444444444440 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.692307692310 times that amount.
(a.k.a. Ludwig van Beethoven)