Loop uptime questions (Bash)

As of now I have two questions but I will have a few more questions once these two have been resolved.
1. First how can I make the script output like this

1 Machine 1
2 Machine 2
3 Machine 3

instead of this? Where the rows of information get chopped up into separate rows which I don't want.

$ bash loop_uptime.sh 

1 Machine
2 1
3 Machine

2. Second question how can I control the spacing better between Number count and Machine name?
Without doing like this? Is there a cleaner and smarter way to do the same spacing control?

echo $n \ \ \ \ \ \ \ $host

.................................................

loop_uptime.sh

#!/bin/bash

n=0

LIST=$(cat ./machines.txt)

for host in $LIST; do
    let n++
    echo $n    $host

    if [ "$n" = "3" ]; then
        break
    fi
done

machines.txt

Machine 1
Machine 2
Machine 3
Machine 4
Machine 5
Machine 6
Machine 7
Machine 8
Machine 9
Machine 10
Machine 11
Machine 12
Machine 13
Machine 14
Machine 15