Time for another round of "when is it OK to omit the multiplication symbol?"

I think for powers of numbers, it's fine to omit, e.g.

2²3² = 36.

What about subscripts, commonly used to show the base of the representation, e.g.

12₅23₅ = 331₅,

or do I need a multiplication symbol:

12₅ × 23₅ = 331₅.


Or, less esoterically, when I've got a subscripted variable followed by a number, e.g.


(I will not accept "put the 4 first" as an answer)

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