theorem proved term proof

`sigma_one_eight`

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formal statement (Lean)

 732theorem sigma_one_eight : sigma 1 8 = 15 := by native_decide

Term-mode proof.

 733
 734/-- σ_1(45) = 78. -/

Lean names referenced from this declaration's body.

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