Season 1 has 15 episodes. 16 - 24 need deleting. Season 2 has 15 episodes. 16 - 34 need deleting. Season 3 has 30 episodes. 31 - 36 need deleting. Season 8 to be deleted. Consists of special episodes, episodes from "Alphablocks", and episodes from "Numberblocks and Alphablocks". TMDB Numberblocks and Alphablocks is https://www.themoviedb.org/tv/247938-alphablocks-numberblocks TMDB Alphablocks is https://www.themoviedb.org/tv/32037-alphablocks Season 9 and 10 don't exist that I can find.

Source - Numberblocks and Alphablocks https://www.bbc.co.uk/iplayer/episodes/p0bmx9d2/alphablocks-numberblocks

Source - Numberblocks https://www.bbc.co.uk/iplayer/episodes/b08bzfnh/numberblocks

Source - Alphablocks https://www.bbc.co.uk/iplayer/episodes/b01cz0p1/alphablocks