摘要
给出了以下四个计算公式及应用实例:①求不大于任一指定数a的自然数中存在多少个素数的计算公式。②求任意一个偶数都存在有多少对不同形式的1+1形式的计算公式。③求不大于任一指定数a的自然数中存在有多少对孪素数的计算公式。④求不大于任一指定数a的自然数中存在有多少对四重素数的计算公式。
In this paper,four calculating formulas (as follows) and some applied cases on n-fold calculating sieve formula are showed. ①It is used to calculate the number of prime number in the interval [1,a] (a is a natural number). ②It is used to calculate the number of different ways of '1+1' to an even integer. ③It is used to calculate the number of prime twins in the interval [1,a]. ④It is used to calculate the number of prime four folds in the interval [1,a].
出处
《河南科学》
2003年第2期131-136,共6页
Henan Science
基金
河南省自然科学基金项目(0111050900)