CREATE TABLE table_17355579_1 (series__number INT, directed_by VARCHAR, written_by VARCHAR)

Name the series number directed by richard thorpe written by dee johnson
SELECT MAX(series__number) FROM table_17355579_1 WHERE directed_by = "Richard Thorpe" AND written_by = "Dee Johnson"
SELECT MAX("series__number") FROM "table_17355579_1" WHERE "Dee Johnson" = "written_by" AND "Richard Thorpe" = "directed_by"