Numbers k whose abundance is 4: sigma(k) - 2*k = 4.

A088832

Numbers k whose abundance is 4: sigma(k) - 2*k = 4.

Terms

    a(0) =12a(1) =70a(2) =88a(3) =1888a(4) =4030a(5) =5830a(6) =32128a(7) =521728a(8) =1848964a(9) =8378368a(10) =34359083008a(11) =66072609790a(12) =549753192448

External references