Older / Newer links and excluding category

I have the following code inserted Above The Loop in the ATO to exclude category #3 from appearing on the main pages of the web site (or search for 'em, etc.).

Didn't think it through, though, because it does exactly what I asked it to... exclude cat 3 from the front page (only). When I click on the Older / Newer links, category 3 posts reappear. The idea was to create the illusion to visitors that category 3 posts weren't part of the main site, and were only accessible if you clicked the page tab I have set up for them.

After reading another posts herein I tried this code instead:

Got the same result - worked on front page, but not older / newer pages. Makes sense.

Figured I either needed to:

• change is_home or is_front_page to another command,
• expand that section to include a command that referred to the Older / Newer links, or
• add another segment of of code identical to the above and replace is_home or is_front_page with a tag that referred to whatever the Older / Newer links are IDed as.

Just know I ain't got it right. Please share any insights you have that'll bring my coding prowess up to speed with my goal so I can resume my spot at the clever table. Thanks.