theorem proved term proof

`sigma_two_eight`

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formal statement (Lean)

1660theorem sigma_two_eight : sigma 2 8 = 85 := by native_decide

Term-mode proof.

1661
1662/-- σ_2(10) = 1 + 4 + 25 + 100 = 130. -/

Lean names referenced from this declaration's body.

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