Go - Download file from URL with Sequence - arrays

Question

i am trying to learn some new stuff with GoLang, and got a litlebit stuck, probaly the reason is just that i am not very good at using arrays.
So heres what i want to do:
Make variable.
Download with that variable.
Add ++1 for that variable
Download with added 1
and loop it lets say 10 times.
I am all good with points 1 and two, but little stuck with 3 & 4. :).
all the files come in .pdf, thats why i made that strconv there.
I probaly should make somekind of Loop in main, and call DownloadFile function with some array parameters in there?
package main
import (
"fmt"
"io"
"net/http"
"os"
"strconv"
)
func main() {
url_id := strconv.Itoa(23430815+2)
filename := url_id+".pdf"
fileUrl := "https://someurLid="+url_id
if err := DownloadFile(filename, fileUrl); err != nil {
panic(err)
}
fmt.Println(fileUrl)
}
func DownloadFile(filepath string, url string) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, resp.Body)
return err
}

Answer 1

try this.
package main
import (
"fmt"
"io"
"net/http"
"os"
"strconv"
)
func main() {
url_id_num := 23430815+2
for i := 0; i < 10; i++ {
url_id := strconv.Itoa(url_id_num+i)
filename := url_id+".pdf"
fileUrl := "https://someurLid="+url_id
if err := DownloadFile(filename, fileUrl); err != nil {
panic(err)
}
fmt.Println(fileUrl)
}
}
func DownloadFile(filepath string, url string) error {
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, resp.Body)
return err
}

Answer 2

Cerise Limón gave the answer and thats thats how it worked out.
arr := make([]uint8, 3) //How many times it loops
url_id := 23430815 //Starting from id, filename
for range arr {
filename := strconv.Itoa(url_id)+".pdf"
fileUrl := "https://someurl?id="+strconv.Itoa(url_id)
if err := DownloadFile(filename, fileUrl); err != nil {
panic(err)
}
fmt.Println(fileUrl)
url_id++
}
Thank you for pointing out where i should start! :).