pyBuildPyramidOfBlocks

# Build a Pyramid of Blocks
while True:
    num = int(input("Enter number of blocks (1, 3, 6, 10, 15  etc.): "))
    # Work out the number of rows required for the requested number of blocks
    rowmax, blks = 0, 0
    while blks < num:
        blks += rowmax
        rowmax += 1
    if blks == num:
        break
    print("Not a valid number of blocks\n")

for row in range(rowmax -1):
    sp = (rowmax - row) * 2
    print(" " * sp + "[ ] " * (row+1))

# Sample output:
#
# Enter number of blocks (1, 3, 6, 10, 15  etc.): 15
#             [ ]
#           [ ] [ ]
#         [ ] [ ] [ ]
#       [ ] [ ] [ ] [ ]
#     [ ] [ ] [ ] [ ] [ ]
#
# Process finished with exit code 0
#