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abelian_is_leinster_iff_cyclic_perfect

Specification

An abelian group is a Leinster group if and only if it is cyclic with order equal to a perfect number. Reference: Leinster, Tom (2001). "Perfect numbers and groups". Theorem 2.1.

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Lean 4 Statement 
theorem abelian_is_leinster_iff_cyclic_perfect (G : Type*) [CommGroup G] [Fintype G] :
    IsLeinster G ↔ IsCyclic G ∧ Nat.Perfect (Fintype.card G)
ID: Wikipedia__LeinsterGroup__abelian_is_leinster_iff_cyclic_perfect
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