Solutions k of the equation s(k) = s(k-1) + s(k-2) where s(k) = usigma(k) - k is the sum of proper unitary divisors of k (A063919).

A332974

Solutions k of the equation s(k) = s(k-1) + s(k-2) where s(k) = usigma(k) - k is the sum of proper unitary divisors of k (A063919).

Terms

    a(0) =3a(1) =21a(2) =321a(3) =1257a(4) =3237a(5) =146139a(6) =268713a(7) =584835a(8) =26749089a(9) =9988999095a(10) =25997557299a(11) =54449485353a(12) =935628578283

External references