"Kevin" wrote...
....
I'm working with it now and I've reached something of a road block. The
formula works fine with tag numbers 0 thru 16. 17 and higher return "No
Match".

Can the formula be altered to handle higher numbers? Four digit numbers?
....
"Harlan Grove" wrote in message
....
=IF(INDEX(FREQUENCY(Tag_number,15-{0.000000000000001;0}),2),15,
"No Match")

If all the numbers for which you'd be searching were integers < 10^15,
change the formula to

=IF(INDEX(FREQUENCY(Tag_number,NumberSought-{0.5;0}),2),NumberSought,
"No Match")

Otherwise, you'll need to make the small number not as small, e.g.,

=IF(INDEX(FREQUENCY(Tag_number,NumberSought-{0.000001;0}),2),NumberSought,
"No Match")