theorem proved term proof

`sigma_three_one`

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formal statement (Lean)

1829theorem sigma_three_one : sigma 3 1 = 1 := by native_decide

Term-mode proof.

1830
1831/-- σ_3(2) = 1 + 8 = 9. -/

Lean names referenced from this declaration's body.

sigma in IndisputableMonolith.Decision.AbileneParadox decl_use
sigma in IndisputableMonolith.NumberTheory.Primes.ArithmeticFunctions decl_use