In America and Europe, many people consider 13 an unlucky number.
The reason for the superstition is open to question. In Japan, the numbers 19, 33, and 42 are considered unlucky. The reasons for these superstitions aren’t so unclear.
The Japanese word for the number 19 sounds much like the word for “bad luck”. The word for 33 sounds like the word for “trouble”, and the word for the number 42 sounds like the word for “death”!