Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_22580855_1 (series_no INTEGER, us_viewers__millions_ VARCHAR)

### Question ###
which is the  maximun serie episode number when the millions of North American spectators is 3.14?

### Accurate SQL ###

SELECT MAX(series_no) FROM table_22580855_1 WHERE us_viewers__millions_ = "3.14"