Claude on Question 1, Sep 10
Is 91 a prime number? Think step by step and then answer "[Yes]" or "[No]".Step 1: Check what 91 is.
91 is an odd number greater than 1, so I need to test divisibility by primes up to √91 ≈ 9.54 — that is, 2, 3, 5, and 7.
Step 2: Test each prime.
- •2: 91 is odd → not divisible.
- •3: digit sum = 9 + 1 = 10, which is not divisible by 3 → not divisible.
- •5: 91 doesn't end in 0 or 5 → not divisible.
- •7: 7 × 13 = 91 → divisible!
Step 3: Conclusion.
Since 91 = 7 × 13, it has divisors other than 1 and itself, so it is composite.
[No]
Exact recordShowHideThe model id, the run, the verbatim text with line numbers and its full sha256
- Scored
- answered · correct · format ok
- Received
- 2026-09-10 22:10:08 UTC
- Run
- 20260910T221001Z-bb5bd1
- Served by
- Claude Platform on AWS · HTTP 200 · finish stop
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- 494 characters · 291 tokens out incl. hidden reasoning · 4.0 s
Highlighted: the last [Yes]/[No] bracket, which is the scored answer (No).
**Step 1: Check what 91 is.**
91 is an odd number greater than 1, so I need to test divisibility by primes up to √91 ≈ 9.54 — that is, 2, 3, 5, and 7.
**Step 2: Test each prime.**
- **2:** 91 is odd → not divisible.
- **3:** digit sum = 9 + 1 = 10, which is not divisible by 3 → not divisible.
- **5:** 91 doesn't end in 0 or 5 → not divisible.
- **7:** 7 × 13 = 91 → **divisible!**
**Step 3: Conclusion.**
Since 91 = 7 × 13, it has divisors other than 1 and itself, so it is composite.
[No]
End of response · 13 lines · 494 characters · sha256 76128382ed1ebce79dd9855dea962bb7174c80215770e542a137d85a5b74e6ab