package main import ( "fmt" "math" ) func prime(value int) bool { if value <= 1 { return false } if value == 2 || value == 3 || value == 5 || value == 7 { return true } if value%2 == 0 || value%3 == 0 || value%5 == 0 || value%7 == 0 { return false } factor := 7 c := []int{4, 2, 4, 2, 4, 6, 2, 6} max := int(math.Sqrt(float64(value))) if max*max == value { return false } for factor < max { for i := 0; i < len(c); i++ { factor += c[i] if value%factor == 0 { return false } } } return true } func main() { var nCount int n := 1000 for i := 1; i <= n; i++ { if prime(i) { nCount += 1 fmt.Printf("%5d", i) if nCount%8 == 0 { fmt.Println("") } } } fmt.Println("Count =", nCount) }
求n以内的所有素数之Golang实现,布布扣,bubuko.com
原文地址:http://my.oschina.net/xlplbo/blog/293633