By the way, what are the characteristics of numbers that are multiples of 2, 3 and 5 at the same time?

Characteristics of multiples of 2: all are even numbers, that is, integers of 0, 2, 4, 6 and 8 bits;

Characteristics of multiples of 3: the sum of numbers is multiples of 3;

Characteristics of multiples of 5: each bit is an integer of 0 or 5;

The characteristic of being a multiple of 2, 3 and 5 at the same time: the unit bit is 0, and the sum of numbers is a multiple of 3.