theorem proved term proof

`sigma_two_six`

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formal statement (Lean)

1657theorem sigma_two_six : sigma 2 6 = 50 := by native_decide

Term-mode proof.

1658
1659/-- σ_2(8) = 1 + 4 + 16 + 64 = 85. -/

Lean names referenced from this declaration's body.

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