Increments with Numbers and letters

I am trying to make a sort list with numbers and letters.
1a
1b
1c < when z is done it goes to
2a
2b
2c
etc…

but i need to go to to 5000.

is it possible to do or is there a formula that can help.

To cell A1:

=INT((ROW(A1)+25)/26)&CHAR(CODE("a")+MOD(ROW(A1)-1;26))

and drag the formula down.

To quickly fill in the bottom cells with a formula after entering the formula in cell A1:

  1. Enter in the Name box (box with cell address): A1:A5000 and press Enter. Cells A1:A5000 should be selected.
  2. Press Ctrl+D
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