Generating prime numbers with go routines

main.go

package main

import (
	"fmt"
	"math"
	"math/rand"
	"time"
)

func generate_prime(min int, max int, result chan int) {

MainLoop:

	// Generate number between min and max
	x := (rand.Int() % (max - min + 1)) + min

	// Test for prime
	for i := 2; i <= int(math.Sqrt(float64(x))); i++ {
		if x%i == 0 {
			// If its divisible, go to function start
			goto MainLoop
		}
	}

	// Send result via chan
	result <- x

}

func main() {

	// Number of routines to start
	num_routines := 100

	// Buffered chan to get results on routines
	result := make(chan int, num_routines)

	// Seeding RNG with current time
	rand.Seed(time.Now().Unix())

	// Starting routines
	for i := 0; i < num_routines; i++ {
		go generate_prime(100000, 1000000000, result)
	}

	// Waiting for routines to finish
	results := 0
	for results < cap(result) {
		fmt.Println(<-result)
		results++
	}

}