Selecting every nth name in a list

[aftershokk]

I have a list with 50,000 names in cloumn A.
I need to select every 15th name and place an "x" in column B indicating the select.
thanks!

 

[Barrie Davidson]

Try placing this in column B and copy down:

=IF(INT(ROW()/15)=ROW()/15,"x","")

Regards,