Validate Cells For Numeric Range Of Consecutive Numbers

I would like to " Validate Data In A Vertical Column To Not Allow Non Consecutive Numbers Less Than 100"

756415
10
456132
7
456123
12

The above is a valid list. Below would be an invalid list:

756415
10
13
456132
7
7
456123
12
13

This part of a larger scope, but I have a macro that will crash if the data entered is entered by way of the invalid list, it works perfectly with the valid list. I am limited to one column user's will input the data via a Barcode scanner that after it recieves input it enter's a "Hard" return. This is a warehouse pickticket program, user's scan their ticket id's (numbers greater than 100000) and then the number of lines on the ticket (usually not greater than 15)