How to Create unique automatic No.

I am Making A form for students in which I want to do that when form screen initialize automtic a unique number which is plus 1 from previous number appears on screen and that number should not repeat again.
Please help me I am facing a lot of problem.

If I’m understanding you want to give a student a unique number witch won’t repeat and if the number was excited it should change again correct me if I’m wrong?

Please, next time search in the community before asking.

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