Special SSN

Given a 9 digit number, check if it follows this pattern:

• First digit should be divisble by 1.
• First and second digits together should be divisble by 2.
• And so on. Full number should be divisble by 9.

Here is an example: 123252561.

Here “1” is divisble by 1, “12” is divisble by 2 etc.

Example run:

$ python3 special_ssn.py 123252561
123252561 follows special SSN pattern.

$ python3 special_ssn.py 123252562
123252562 doesn't follow special SSN pattern.

If the length of the input number is not exactly 9, your program should print an error message. Like so:

$ python3 special_ssn.py 123252
input is invalid.

Once you get this working, let us make the problem more generic. Instead of 9 digits, your program should accept any number of digits and check if it follows the pattern. Examples (all the following examples numbers follow the pattern):

$ python3 special_ssn.py 1

$ python3 special_ssn.py 12

$ python3 special_ssn.py 123

$ python3 special_ssn.py 1232

$ python3 special_ssn.py 12325

$ python3 special_ssn.py 123252

$ python3 special_ssn.py 1232525

$ python3 special_ssn.py 12325256

$ python3 special_ssn.py 123252561