Program to find the number in a digit whose positions are divided by 3

DECLARE @Number INT = 123456789

;WITH getDigitsCTE AS (
    SELECT 
       Quotient = @Number / 10 
      ,Remainder = @Number % 10  

    UNION ALL

    SELECT 
         Quotient / 10
       , Quotient % 10

    FROM getDigitsCTE

    WHERE Quotient > 0
)
SELECT
	X.Number
FROM
(SELECT 
		Position = ROW_NUMBER()OVER(ORDER BY Remainder)
        ,Number = Remainder		
FROM getDigitsCTE)X
WHERE X.Position % 3 = 0

/*
Number
-------
3
6
9
*/