First, many people recite pi, mainly because everyone who has received nine-year compulsory education knows pi and is familiar with it. From the beginning of elementary school, I knew the circle, and I knew the pi. And the frequency of using pi is quite high. From the beginning of knowing the circle to the end of learning career, pi should be used from time to time. The use of high frequency makes people have a conditioned reflex to pi. As long as it is about infinity, the first reaction will think of pi. Other numbers, such as natural constants, are rare and only appear in senior grades. In the process of using them, it is basically unnecessary to use their specific numbers, just borrow their symbols.
Second, there are many people who recite pi, and another very important reason is the need of work. In the process of mathematical computer modeling, in the process of advanced mathematics learning, and in the field of high-precision engineering, the precision of pi is relatively high, and a dozen or even hundreds of millions of digits may be used after the decimal point of pi. If you often use pi for design calculation in a certain field of work, you will consciously recite this pi.
Third, there are many people who recite pi, and the last important reason is to train their memory. The number of pi is irregular and endless. In order to prevent Alzheimer's Harmo's disease, many elderly people will take pi as their back to exercise their brains and keep them alive. There are also some memory training institutions that often use pi to train children's memory ability. Pi is internationally accepted, and many memory experts will also achieve their goals by memorizing Pi in order to train their memory ability. It is precisely because of the general understanding of pi that many people will show it to others as a powerful special skill.
Therefore, pi is widely spread among all kinds of people and people of all ages in these ways, which leads many people to recite pi, but few people recite other numbers.