Numbers n such that sigma(n) divides the sum of the numbers x not coprime to n, with x<=n.

Terms

a(0) =18a(1) =135a(2) =891a(3) =4095a(4) =10560a(5) =13120a(6) =14144a(7) =21600a(8) =23199a(9) =74655a(10) =144495a(11) =192311a(12) =404415a(13) =4197375a(14) =4612608a(15) =5675775a(16) =6664680a(17) =9180800a(18) =10953215a(19) =11110400a(20) =14381055a(21) =18162144a(22) =18420480a(23) =18920000a(24) =20765024a(25) =25159680a(26) =32058351a(27) =41055200a(28) =55889920a(29) =65327104