I can beat 2 characters.
How about this (66 chars): 
$n=length$a++*$a/2;map{map{printf" %$n.d",++$k}2..$_;print$/}0..$a

[download]

There are two "\n", I know, but writes exactly what I want... :-)
Hopes

In reply to Re: Re: Re: (golf) Triangle of numbers by hopes
in thread (golf) Triangle of numbers by hopes

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