Accuracy Proof

Zero errors.
Live. In your browser.

Click Run Tests and watch Baillie-PSW verify against known primes in real time. Every result is computed right here — no server, no tricks.

Test 1 — Edge Cases & Small Numbers
0, 1, 2, 3, 4, negative numbers, first 30 primes
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Test 2 — Carmichael Numbers
Pseudoprimes that fool simple Fermat tests — Baillie-PSW must reject them all
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Test 3 — Complete Verification 0 to 500,000
Every integer — compared against reference Sieve of Eratosthenes
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Test 4 — Large Known Primes
Verified primes up to 10⁵⁰ — including our discovery
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Test 5 — The Google AI Challenge
Google AI said 10⁵⁰+151 is composite. We disagree.
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✗ Google AI said
"Divisible by 11.
Composite number."

Error: alternating digit sum calculated on 4 digits only — ignored 47 zeros.
✓ NextPrime says
Pending test...
Waiting to start...
—N mod 11
—Miller-Rabin
—Lucas test
—Time (ms)