Numbers k such that (1/k) * Sum_{d|k} d*sigma(d) is an integer.

Terms

a(0) =1a(1) =39a(2) =793a(3) =1638a(4) =2379a(5) =2394a(6) =7137a(7) =8190a(8) =11970a(9) =14274a(10) =18135a(11) =19530a(12) =30927a(13) =31122a(14) =35685a(15) =36270a(16) =50700a(17) =61854a(18) =71370a(19) =76921a(20) =81900a(21) =92781a(22) =99918a(23) =119700a(24) =154635a(25) =155610a(26) =185562a(27) =195300a(28) =230763a(29) =253890