Is it possible to do a more concise IF x = 1 OR x = 2 OR x = 3 in Google Sheets?

Question

The following is a part of a formula I'm using to filter for week day rows (for conditional formatting):

    OR(
        MOD(ROW(),7)=2,
        MOD(ROW(),7)=3,
        MOD(ROW(),7)=4,
        MOD(ROW(),7)=5,
        MOD(ROW(),7)=6
    ),

What I really want to be able to say is something like the below pseudo-code:

    OR(
        MOD(ROW(),7) IN (2,3,4,5,6)
    ),

Is there a way of doing that? I prefer the non-repating, more concise, and (I think) more performant nature of the proposed version.

Performance isn't something I expected to have to think about but this is a snippet of a pretty long formula I'm running on every cell in a spreadsheet and it gets quite slow.

Answer 1

Since the result of MOD(ROW(),7) can have 2 inappropriate values (0 and 1) and 5 suitable values (2..6), it makes sense to check the condition for a shorter sequence:

MOD(ROW(),7)>1

In this case, there is no need to connect multiple conditions using OR()

Answer 2

To answer your general question.

=COUNTIF({2,3,4,5,6},MOD(ROW(),7))>0