human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series., Series No., Episode, Director, Writer, Original airdate
###Question: Name the least series number for episode number being 78
gpt
SELECT MIN Series No. FROM table WHERE Episode No. Episode No. refers to the episodes number in the overall series, whereas Series No. refers to the episodes number in this particular series. = 78