SPT_Values is un-documented table. It seems it is available from Sybase days and it is used in system stored procedures to translate codes into readable strings.
It stores the specific number of each SQL Server Property. If you execute below query, you can get the diffrent kind of result and you can use it as per the need.
select min(number) FROM master..spt_values
select min(number) FROM master..spt_values where number > 0
select max(number) FROM master..spt_values
You can use to generate number from 1 to 2048 as well.
SELECT distinct number
WHERE number BETWEEN 10 AND 15