1. 1 is a happy number, because it symbolizes simplicity, simplicity and happiness, so it is one of the numbers representing happiness.

2.2 is also a happy number, representing right, so 2 is a happy number.

3.3 is also a happy number, symbolizing a person's three Liang, so 3 is also a happy number.

4.4 is also a happy number, symbolizing things and things in all directions, so 4 is also a happy number.

The above is a common introduction of Happy, I hope it will help you.