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theorem proved term proof

sigma_two_fortyfive

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formal statement (Lean)

2094theorem sigma_two_fortyfive : sigma 2 45 = 2366 := by native_decide

proof body

Term-mode proof.

2095
2096-- Note: σ_2(360) and σ_3 values for large numbers require careful computation
2097-- Leaving those for future sessions when we can verify the exact values
2098
2099/-! ### Balanced primes ((p_{n-1} + p_{n+1})/2 = p_n) -/
2100
2101/-- 5 is a balanced prime: (3 + 7)/2 = 5. -/

depends on (10)

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