Answer by Bob Hovious

I ran your code, but it produced NULL values for @SqlStmt.
Here's a quick tally table solution:

DECLARE @BigArray varchar(max)
SET @BigArray = ',1,2,3,5,7,11,13,17,19,23,29,31,'

;with Array AS (select substring(@bigArray,N+1,charindex(',',@bigArray,N+1)-(N+1)) as element
    			from dbo.tally
    			where substring(@bigArray,N,1) = ','
    			and N < len(@bigArray)
)

-- insert into Sometable
select * from Array
where element in (1,3,13,31)

My question is: If you know in advance that those four elements (1,3,13,31) are the only ones that matter, why not just insert them?