Numbers Sum_(j=1..k) sigma(j) when Sum_(j=1..k) sigma(j) / sigma(k) is an integer.

A168130

Numbers Sum_(j=1..k) sigma(j) when Sum_(j=1..k) sigma(j) / sigma(k) is an integer.

Terms

    a(0) =1a(1) =8a(2) =690a(3) =109668a(4) =1235133a(5) =5475784320a(6) =6118230000a(7) =28361961000a(8) =279467858880

External references