"an such" is not correct or usable in written English.
In written English, the phrase "and such" is usually used when referring to items or things that are similar to what has just been mentioned or described. Example: She brought some chips, dip, and such for the party.
Exact(60)
I read the Koran and saw how Moses is an such an important prophet there.
there is an such that.
or (b there exists an such that.
Since, we can choose an such that.
There is an such that and.
Then there is an such that.
or there exists an such that (3.5).
Since, there exists an such that.
If there exists an such that (1.9).
(i) there exists an such that (1.8) .
there exists an such that (1.8).
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com