Bash Scripting -Use Of Regular Expression In Variable

Bash Scripting -Use Of Regular Expression In Variable

I am new to bash scripting so please excuse me if i am asking the wrong
question.
I am trying to write a script :)
First_Variable=800
Second_Variable=850
I want to feed all the number between First and Second variable to my
script excluding 830. Say i am using seq command to count from first
variable to second one but skip one number in between deliberately.
Any help??? please