the sum of the three digits in the billions period is 4
assuming a 12-digit number, the digits must be
103 or 301 or 130 or 310
or 112 or 121 or 211
If there are more than 12 digits, then there may be a leading 0.
103 or 301 or 130 or 310
or 112 or 121 or 211
If there are more than 12 digits, then there may be a leading 0.