Table: episodes_table_55
Columns: no_in_series
title
directed_by
written_by
original_air_date
prod_no
viewers_millions

Question: What is the production number for the episode called "Random on Purpose"?
SQL: SELECT "prod_no" FROM episodes_table_55 WHERE "title" = '"Random on Purpose"'

Question: How many episodes have 18.73 million viewers?
SQL: SELECT COUNT("no_in_series") FROM episodes_table_55 WHERE "viewers_millions" = '18.73'