I’ve posted about using keyboard macros to record and play back repetitive tasks. Macros include a counter which lets you insert numerical values that increment each time the macro is called.
For example, go to a new line and start a macro with C-x ( and then hit C-a to move to the start of the line, C-x C-k C-i to insert the macro counter (initially zero) and then RET to go to a new line and C-x ) to stop the recording. Run the macro a few times with C-x e and then just e to repeat the macro and you’ll get something like this:
0 1 2 3 4
The counter starts at zero every time you define a new macro. To set it to another value, use C-x C-k C-c before defining or invoking a macro.