Hello and welcome to Android Forums. Hopefully I can help you with your problem.
If you've reset your tablet back to factory settings without making a backup then those apps that you've downloaded are lost. My suggestion would be to do a thorough search of Google Play or Amazon/Android apps for the app you seek.
There is also the possibility that app has been removed and is no longer available. That happens from time to time. I've had it happen to me.
If you have any other questions regarding your device, I invite you to join Android Forums. We have many sections for specific devices which contain a wealth of information.
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