This formula was written by Leon Hardeuler (1707-1783) in an article entitled & Amplaquosome observations on infinite series &; Ampraquo In this paper, n is a natural number and p is a prime number. Euler product formula relates a summation expression of natural numbers with a continued product expression of prime numbers, which contains important information about the distribution of prime numbers. In order to commemorate Riemann's contribution, the summation formula at the left end of Euler product formula is named Riemann, and the symbol ζ(s) used by Riemann is called Riemann ζ function.