Superscript or subscript

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21

SUM[sub]i=1[/sub][sup]k[/sup] p[sub]k[/sub][sup]n[sub]k[/sub][/sup]
SUM[sub]i=1[/sub][sup]k[/sup] p[sub]k[/sub][sup]n[/sup][sub]k[/sub]

22

SUM<sub>i=1</sub><sup>k</sup> p<sub>k</sub><sup>n<sub>k</sub></sup>
SUM<sub>i=1</sub><sup>k</sup> p<sub>k</sub><sup>n</sup><sub>k</sub>
PROD (n<sub>k<\sub> + 1)

23

SUM<sub>i=1</sub>

24

Uhhh… HTML’s been disabled since then.

25

And I was just about to post a “I have to go to work, if anyone can tell me why this isn’t working I’ll be eternally grateful” message…

Thanks! Let’s see if I can think of a workaround after I have a bit more coffee.