Creating a Summation Expression with k and m Variables

[alyafey22]

How to write something similar to the following

View attachment 1121

Or is it better to write

$$\sum_{n=k ,m=1}^{k+1}$$

 

[Jameson]

Try this syntax that produces the following output:

\large \sum_{p^{m} \le x \atop \text{p is prime }m \ge 1 }

$$\large \sum_{p^{m} \le x \atop \text{p is prime }m \ge 1 } $$

The spacing and sizing could use a little work but it's a good start for now.

EDIT: Just found another one on the same page. Try this code as well:

\large \sum_{\substack{p^{m} \le x \\ \text{p is prime }m \ge 1}}

$$\large \sum_{\substack{p^{m} \le x \\ \text{p is prime }m \ge 1}}$$

 

[Evgeny.Makarov]

There is also the subarray environment, which is similar to the regular array environment. It allows aligning the subscripts left or right.

\atop is a plain TeX command.