Theory:

LibreOffice Calc allows you to generate auto numbers.
 
To generate auto numbers, follow the steps given below.
  • Click the LibreOffice Calc Spreadsheet from the LibreOffice Start Centre.
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  • By default, you always get a workbook (sheet \(1\)) when you open the LibreOffice Calc application.
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  • Enter the first two numbers of the series in two cells. 
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  • Select both the cells.
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  • Move the cursor to the right side bottom of the cell. The cursor will change to the plus sign.
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  • Drag the plus sign to the desired cell.
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  • The numbers will be generated automatically. You can generate any series by using this method.
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