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.


input "Number of rows: "; rows
dim colSize(rows)   
for col=1 to rows
    colSize(col) = len(str$(col + rows * (rows-1)/2))
next
 
thisNum = 1
for r = 1 to rows
    for col = 1 to r
        print right$( "  "+str$(thisNum), colSize(col)); " ";
        thisNum = thisNum + 1
    next
    print
next