How do I get this pattern in Python using nested loops?

Question

1
2 3
4 5 6
7 8 9 10

for r in range (1,5):
    for c in range (0,r):
        print(r+c, end = " ")
    print()

but, this returns output as:
1
2 3
3 4 5
4 5 6 7

Please let me know how should I get the sequence to not repeat everytime by the last digit of preceeding line....

Answer 1

current = 1
counter = 0
for x in range(0, 5):
    l = ""
    for y in range(current, current + x):
        counter += 1
        l = l + str(counter) + " "
    print(l)

This makes

1 
2 3 
4 5 6 
7 8 9 10