a(1) = 1; for n > 1, a(n) is the largest number m such that sigma(m) = tau(m)^n or 0 if no such m exists.

A349007

a(1) = 1; for n > 1, a(n) is the largest number m such that sigma(m) = tau(m)^n or 0 if no such m exists.

Terms

    a(0) =1a(1) =3a(2) =7a(3) =2667a(4) =27559a(5) =677207307a(6) =225735769a(7) =698915267211

External references