# What happens if you change a subscript in a correctly written chemical formula?

For example, ${\text{NO}}_{2}$ exists. $\text{N"_2"O}$ exists. ${\text{N"_2"O}}_{5}$ exists. ${\text{N"_37"O}}_{2}$ surely does not, because it would be ridiculous to have 37 nitrogen atoms attached to only two oxygens.