CREATE TABLE table_name_21 (population INT, county VARCHAR, number_of_households VARCHAR)

Which Population has a County of mississippi, and a Number of households smaller than 17,741?
SELECT SUM(population) FROM table_name_21 WHERE county = "mississippi" AND number_of_households < 17 OFFSET 741
SELECT SUM("population") FROM "table_name_21" WHERE "county" = "mississippi" AND "number_of_households" < 17 OFFSET 741