theorem proved term proof

`sigma_zero_thirty`

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formal statement (Lean)

 995theorem sigma_zero_thirty : sigma 0 30 = 8 := by native_decide

Term-mode proof.

 996
 997/-- σ_1(30) = 72. -/

Lean names referenced from this declaration's body.

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