
    Write a function that helps detect potential fraudulent transactions by checking if a transaction ID number is one less than twice its reverse, a pattern commonly associated with automated attack sequences. This validation is part of the bank's fraud detection system that analyzes transaction patterns to identify suspicious automated attempts.
    

    
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 that helps detect potential fraudulent transactions by checking if a transaction ID number is one less than twice its reverse, a pattern commonly associated with automated attack sequences. This validation is part of the bank's fraud detection system that analyzes transaction patterns to identify suspicious automated attempts.
    

    """
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 that helps detect potential fraudulent transactions by checking if a transaction ID number is one less than twice its reverse, a pattern commonly associated with automated attack sequences. This validation is part of the bank's fraud detection system that analyzes transaction patterns to identify suspicious automated attempts.
    

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