APK4Fun collected total 2 versions for Prime Number APK (com.kavinzhao.pncfa). You could download one of the legacy or old version of it.
Prime Number App Version History
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Prime Number v3 APK (Latest Version APK)
► Updated: July 1, 2017
► What's New in Version 3:
Completely rewritten according to reviews.
Now has better design and algorithm.
Enjoy. -
Prime Number v20160110 APK (Old Version APK)
► Updated: January 10, 2016
► What's New in Version 20160110:
**New Year Update**
Enhanced Material UI.
More features.
Allows to disable ads.
Bug fixes.