
    Write a function to determine if a delivery route identifier number follows the special pattern where it is exactly one less than twice its reverse number, which could indicate a potential complementary return path in the transportation network. For example, if route 241 is being analyzed, check if 241 is one less than twice 142 (its reverse).
    

    
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function to determine if a delivery route identifier number follows the special pattern where it is exactly one less than twice its reverse number, which could indicate a potential complementary return path in the transportation network. For example, if route 241 is being analyzed, check if 241 is one less than twice 142 (its reverse).
    

    """
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function to determine if a delivery route identifier number follows the special pattern where it is exactly one less than twice its reverse number, which could indicate a potential complementary return path in the transportation network. For example, if route 241 is being analyzed, check if 241 is one less than twice 142 (its reverse).
    

    """
    return 2 * rev(n) == n + 1