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theorem proved term proof

isolated_prime_onehundredtwentyseven

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formal statement (Lean)

2867theorem isolated_prime_onehundredtwentyseven : Prime 127 ∧ ¬Prime 125 ∧ ¬Prime 129 := by native_decide

proof body

Term-mode proof.

2868
2869/-- 131 is NOT isolated: 131 - 2 = 129 (composite), but 131 + 2 = 133 = 7 × 19 (composite). -/
2870-- Check: 129 = 3 × 43, 133 = 7 × 19, so 131 IS isolated.

depends on (5)

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