formula to identify the unique code after filtration using countif or other formula

Friends,

please help me again to make formula to get the unique code after filtration. it will not read the hide rows.
see attached sample.

thanks.

maybe this array formula::

Formula:

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Array Formulae are a little different from ordinary formulae in that they MUST be confirmed in the FIRST CELL ONLY by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. After that, the array can be dragged down as normal, to cover the desired range.

You will know the array is active when you see curly brackets { } - or "curly braces" for those of you in the USA, or "flower brackets" for those of you in India - appear around the outside of your formula. If you do not use CTRL+SHIFT+ENTER you will (almost always) get an error message or an incorrect answer. Press F2 on that cell and try again.

Don't type the curly brackets yourself - it won't work...

Sorry, post removed.

Alkey... not like you to make a mistake... "filtration" = visible cells...

Loosing my mind Lol!

Array formula: must be entered with CTRL+SHIFT+ENTER combination

Formula:

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After the filtration, i want to get the unique code on visible cells only.

Felix, Is that not what Post 2 is doing?

Mr. Glenn,
its great. i have small question on that formula, why there is link to column A?
i didnt expect the result. very nice.
thank you very much. i will mark this as solved.

It's just a counter, starting from 1. However, I agree it's a bit confusing. So, use this instead:

Formula:

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You're welcome.

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