Counting prime numbers in an interval with Excel

Scenario
Suppose you are asked to find out number of prime numbers in an interval.


Suppose lower limit of a range is entered in cell C2 and upper limit in cell C3.
Solution
1. Press CTRL + F3 to open name manager
2. Click "New"
3. In "Name", type rng
4. In "Refers to: " box, enter =ROW(INDIRECT(Sheet1!$C$2&":"&Sheet1!$C$3))



5. Click OK
6. Click Close

In cell E5, enter the following formula :


Hit CTRL + SHIFT + ENTER to confirm this formula as an array formula. If done correctly, Excel will automatically place curly braces {...} around the formula.

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