Consider the case where the first number is 3. The last three digits of this four-digit number can be all numbers less than 1000 that are divisible by three. There is 333 * *, plus the special case 000, there is 334 * *.
Then consider the case where the first number is not 3. Let's consider that from 102 to 297, * * has 66 numbers divisible by 3, and from 402 to 999, * * has 200 numbers divisible by 3. Insert a 3 after the hundreds, tens or digits of these numbers to form a 4-digit number divisible by 3, such as 65438+. Together, these figures are all qualified four digits with the first digit not 3, and * * * has 266*3=798.
Finally, the four digits divisible by 3 are 334+798= 1 132.