數學大師歐勒(Euler) 找到一個計算圓周率的無窮乘積 :

pi/2 = 3/2 * 5/6 * 7/6 * 11/10 * 13/14 * 17/18 * 19/18 * 23/22 * …







有趣的是, 這公式裡, 所有分子都是大於 2的質數, 分母則是不能被 4整除, 且最接近分子的偶數. -Math Masters Euler (Euler) a calculation of pi to find the infinite product: pi/2 = 3/2* 5/6* 7/6* 11/10* 13/14* 17/18* 19/18* 23/22* ... Interestingly, this formula, all elements are of prime number greater than 2, the denominator is not divisible by 4, and the nearest even number of molecules.