user: Question: when the number of spectator are 5.28 millions, which is the smallest number of the episode in series? 
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Prod. code', 'Viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [13.0, 1.0, '"Spasticity"', 'Constantine Makris', 'Andrew Lenchewski', 'June3,2010', 'RP#201', '5.84']
SQL:

assistant: SELECT MIN("No. in series") FROM "Table" WHERE "Viewers (millions)" = '5.28';