theorem proved term proof

`sigma_three_three`

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formal statement (Lean)

1835theorem sigma_three_three : sigma 3 3 = 28 := by native_decide

Term-mode proof.

1836
1837/-- σ_3(4) = 1 + 8 + 64 = 73. -/

Lean names referenced from this declaration's body.

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