New answers tagged pdf-format
What you want, I think, is the cell option ShowCellLabel -> False. You can edit the stylesheet to add the option to the styles "Input" and "Output" in the "Printout" environment. Or you can add them to a notebook, assuming it has the default style definitions, as follows: SetOptions[EvaluationNotebook, StyleDefinitions -> ...
Evaluate this and then save as another nb, open the new nb file, and then save as PDF SetOptions[InputNotebook, CellLabelAutoDelete -> True];
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