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

A168128

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

Terms

    a(0) =1a(1) =2a(2) =23a(3) =247a(4) =699a(5) =55921a(6) =70936a(7) =152730a(8) =478017a(9) =4879815a(10) =12909834588a(11) =223070292558a(12) =583407686653a(13) =601718433498

External references