If your data is in column A then in column B you can use this formula:

=IF(COUNTIF(A$2:A2, A2)1, A2, "")

it will give you the nombers those are more than once.

"anthonyd" wrote:

Is there a way to filter out all the values in a column that only appear
once, leaving just items that appear 2+ times? I know there's a way to get
rid of duplicates, but I haven't been able to find a feature that would do
the opposite. Thank you for your insight!