sheet.cells(index1,index2) overflow error

I have a macro that generates a lot of output
for each case(c) there are multiple iterations(i) that need to be transferred to an output worksheet

the reference for the output area is of the form

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iterations is a user-defined constant, and case_number is the the number of cases run thus far.
neither iterations nor case_number exceed the limit for an integer, but when their product exceeds 32701, I get an overflow error

I'll try setting caseNumber and iterations to long, but if that works, what's up with that?

Did you try changing the data type to Long?