I have a tracking sheet which needs to corresponds to 365 days of the year 52 weeks of the year (across 52 sheets)

each of the 52 sheets has the same template which is filled in.

the most important cells from these sheets are then transferred to the tracking sheet, these are always the same
(i.e. 'Week 1'!$I$21, 'Week 2'!$I$21)
(i.e. 'Week 1'!$I$41, 'Week 2'!$I$41)
(i.e. 'Week 1'!$I$61, 'Week 2'!$I$61)
(i.e. 'Week 1'!$I$81, 'Week 2'!$I$81)
(i.e. 'Week 1'!$I$101, 'Week 2'!$I$101)
(i.e. 'Week 1'!$I$121, 'Week 2'!$I$121) ETC.

I have set up all the cells for week 1 but cannot now drag the formulas across and keep the cells the same but sheets change.

my question is, how do i do this without having to manually input 'Week 2' 'Week 3' 'Week 4' for about 3640 cells??

I would be massively greatful for any help with this

Cheers,

Stu