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_name_13 ( _number___county VARCHAR, year_joined VARCHAR, previous_conference VARCHAR )

### Question ###
Which #/ County has a Year Joined larger than 1926, and a Previous Conference of olympic?

### Accurate SQL ###

SELECT _number___county FROM table_name_13 WHERE year_joined > 1926 AND previous_conference = "olympic"