Strong law of small numbers

In mathematics, the "strong law of small numbers" is the humorous law that proclaims, in the words of Richard K. Guy (1980, 1988): There aren't enough small numbers to meet the many demands made of them. In other words, any given small number appears in far more contexts than may seem reasonable, leading to many apparently surprising coincidences in mathematics, simply because small numbers appear so often and yet are so few.

Source: Wikipedia — Strong law of small numbers (CC BY-SA 4.0)