keep from duplicating numbers when creating a list

  • Thread starter Thread starter JoelAM
  • Start date Start date
J

JoelAM

I am creating a list of numbers and as the list grows I
sometimes enter in a number inwhich I had entered
previously unknowningly, is there a way to make a spread
sheet so that if I enter a number say 123456 and if later
enter that same number thinking it is a new number, it
will let me know that the number is already on the list?
 
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