Floyd's triangle   lists the natural numbers in a right triangle aligned to the left where

 the first row is   1     (unity)
 successive rows start towards the left with the next number followed by successive naturals listing one more number than the line above.


The first few lines of a Floyd triangle looks like this:

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



Task

 Write a program to generate and display here the first   n   lines of a Floyd triangle. 
(Use   n=5   and   n=14   rows).
 Ensure that when displayed in a mono-space font, the numbers line up in vertical columns as shown and that only one space separates numbers of the last row.


floyd(5)
floyd(14)
 
floyd(n)=
  k = 0
  > r, 1..n
    s = ""
    > j, 1..r
      k += 1
      f = ">"+#.upper(#.log10((n-1)*n/2+j+1)+1)+">"
      s += #.str(k,f)
    <
    #.output(s)
  <
.