
    Write a function to validate patient record numbers by checking if the medical record number is one less than twice its reverse, which serves as a checksum mechanism for data integrity during inter-hospital transfers. The function should help prevent data corruption and ensure accurate patient identification across healthcare systems.
    

    
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 validate patient record numbers by checking if the medical record number is one less than twice its reverse, which serves as a checksum mechanism for data integrity during inter-hospital transfers. The function should help prevent data corruption and ensure accurate patient identification across healthcare systems.
    

    """
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 validate patient record numbers by checking if the medical record number is one less than twice its reverse, which serves as a checksum mechanism for data integrity during inter-hospital transfers. The function should help prevent data corruption and ensure accurate patient identification across healthcare systems.
    

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