<Print a triangle of numbers from a given input> I...

# stackoverflow

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Print a triangle of numbers from a given input
I'm trying to get an output of the following a right triangle with a hollow middle and a right triangle with numbers :
*
**
* *
* *
* *
* *
* *
********

and
1
12
123
1234
12345
123456
1234567
12345678

Here is my code so far
import kotlin.io.*

fun main() {
print("Enter an integer: ")
val n = readLine()!!.toInt()

var i = 1

while (i