
    In a hospital's patient classification system, write a function that validates whether a given patient identifier number follows the specialized hash pattern where it is one less than twice its reversed value, which is crucial for grouping patients with similar readmission risk profiles. This validation function helps maintain data integrity in the patient classification algorithm by ensuring the identifier adheres to the system's mathematical constraints.
    

    
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):
    """
    In a hospital's patient classification system, write a function that validates whether a given patient identifier number follows the specialized hash pattern where it is one less than twice its reversed value, which is crucial for grouping patients with similar readmission risk profiles. This validation function helps maintain data integrity in the patient classification algorithm by ensuring the identifier adheres to the system's mathematical constraints.
    

    """
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):
    """
    In a hospital's patient classification system, write a function that validates whether a given patient identifier number follows the specialized hash pattern where it is one less than twice its reversed value, which is crucial for grouping patients with similar readmission risk profiles. This validation function helps maintain data integrity in the patient classification algorithm by ensuring the identifier adheres to the system's mathematical constraints.
    

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