input: from typing import List
  
  def print_number_triangle() -> None:
      """
      This function prints a number triangle pattern.
      For each row i from 1 to 5, it prints numbers from 1 to i.
      Each row's numbers are printed without a space in between.
      
      Example:
      >>> print_number_triangle()
      1
      12
      123
      1234
      12345
      """
output:     for i in range(1, 6):
          for j in range(1, i + 1):
              print(j, end='')
          print()