theorem proved term proof

`sigma_two_one`

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formal statement (Lean)

1642theorem sigma_two_one : sigma 2 1 = 1 := by native_decide

Term-mode proof.

1643
1644/-- σ_2(2) = 1 + 4 = 5. -/

Lean names referenced from this declaration's body.

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