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Could anyone help me with the simplest way of coding a triangle..
starting with a 1, and a 123 underneath that and a 12345 underneath that and 1234567 "" "" and then ending with 123456789...

I was wondering if anyone could help me code a triangle that generates the following output:

1
1 2 3
1 2 3 4 5
1 2 3 4 5 6 7
...