Where is the list of applications stored in android that are installed after a factory reset?

Question

Android

Hello.
For the sake of interest and maintaining the brain, I began to study programming for android. In addition to the SDK, I also want to understand how the system works inside.
Throw, please, links to good forums (bourgeois can be)
And a specific question in the topic. After the reset, my HTC starts installing 164 apps. I want to leave the phone as "naked" as possible :)
Where is the list of these applications stored?
Thank you!