Crystal reports - how to identify a sequence gap within a column

I am working on a project which requires the ability to identify gaps in numeric sequence within a column.
Does anyone have any thoughts on what a formula such as this?
It can be done in excel using the formula columns in screen shot columns I and J. I is H2+1 starting on I3. J is column I - column H to identify sequence gap size.
Id like to accomplish the same using a crystal formula if possible.
Thanks in advance.
Regards,
Joe

Hi Joe,
Here's what you need to do:
For Column I, create a formula (@I+1) in the report with this code and place it on the Details Section:
whileprintingrecords;
numbervar x;
if onfirstrecord then
     x := {Trans_Num};
     0;
else
     x := x + 1;
2) Create another formula and place this beside the above formula:
EvaluateAfter({@I+1});
numbervar x;
if onfirstrecord then
     0
else
     x - {Trans_Num};
-Abhilash

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Hello,
I`m new to Crystal reports and I`ve got a trouble. I have field which contains an address - street, city, zip code. The example is:
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Hi
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I have found this problem a few times already and I think it is now about time I find a solution for it.
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Hi:
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