a(n) is the smallest k such that usigma(k) = A002110(n), or 0 if no such k exists.

A291356

a(n) is the smallest k such that usigma(k) = A002110(n), or 0 if no such k exists.

Terms

    a(0) =1a(1) =0a(2) =5a(3) =18a(4) =164a(5) =1538a(6) =20018a(7) =408404a(8) =7759748a(9) =148728578a(10) =0a(11) =194482899488a(12) =0a(14) =0a(19) =0a(20) =0a(22) =0

External references