When was the incumbent first elected in the district where the result was a democratic-republican gain? 
CREATE TABLE table_2668401_17 (first_elected VARCHAR, result VARCHAR)
SELECT first_elected FROM table_2668401_17 WHERE result = "Democratic-Republican gain"
### Context: CREATE TABLE table_2668401_17 (first_elected VARCHAR, result VARCHAR) ### Question: When was the incumbent first elected in the district where the result was a democratic-republican gain?  ### Answer: SELECT first_elected FROM table_2668401_17 WHERE result = "Democratic-Republican gain"