Prime Number Counter
v1.6 · 1.1 MB · code 6
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File information
UpdatedJan 13, 2026
PublishedOct 20, 2022
Packagecom.useless.primes
Versionv1.6 (6)
Size1.1 MB
MD54eca50dbf7f153557264990bbed5f39e
Min SDK14
Malware scanTRUSTED
Signature SHA1DC:D7:F6:A2:41:27:04:55:3F:35:88:19:9D:08:21:65:79:E1:CD:64
SignerCN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown
Total downloads10,000
This version10,000
DeveloperFunCoolApps
Age ratingEveryone
What's new in v1.6
Support new Android versions
Security scan
TRUSTED
- Developer signature verified 2026-01-13
- Signature SHA1 DC:D7:F6:A2:41:27:04:55:3F:35:88:19:9D:08:21:65:79:E1:CD:64
- File MD5 4eca50dbf7f153557264990bbed5f39e
How to install Prime Number Counter v1.6 on Android API 14+
Takes about 2 minutes. You'll need roughly 1.1 MB of free storage.
- Grab com.useless.primes_6.apk — hit the Download button above (1.1 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 4eca50dbf7f15355…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.useless.primes_6.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Unknown, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Prime Number Counter — tap Open on the install screen, or find the Prime Number Counter icon in your app drawer.
Common install errors for Prime Number Counter
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android API 14 or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.