18-hyperperfect numbers: n = 18*(sigma(n)-n-1) + 1.

A028501

18-hyperperfect numbers: n = 18*(sigma(n)-n-1) + 1.

Terms

    a(0) =1333a(1) =1909a(2) =2469601a(3) =893748277a(4) =322685352001

External references