Numbers k such that s(k) = s(k-1) + s(k-2), where s(k) is the sum of proper divisors of k (A001065).

A291176

Numbers k such that s(k) = s(k-1) + s(k-2), where s(k) is the sum of proper divisors of k (A001065).

Terms

    a(0) =3a(1) =8a(2) =20a(3) =146139a(4) =584835a(5) =44814015a(6) =1436395095a(7) =9988999095a(8) =25997557299a(9) =193861767939

External references