What does that function do?
Edit. I just googled the function. Excel does not have an equivalent function... but depending on what you are doing there should be other ways.
Please explain what you are trying to accomplish. Are there more than 1 results possible?
example.... if there is only 1 result expected.. you can use:
=INDEX($A$1:$A$63,MATCH(TRUE,$P$1:$P$63>64,0))
confirmed with CTRL+SHIFT+ENTER.
If there are multiple results possible.
=IFERROR(INDEX($A$1:$A$63,SMALL(IF($P$1:$P$63>64,ROW($P$1:$P$63)-MIN(ROW($P$1:$P$63))+1),ROWS($X$1:$X1))),"")
confirmed with CTRL+SHIFT+ENTER, and copied down