Numbers k that divide phi(k)*bigomega(k).

Terms

a(0) =1a(1) =4a(2) =12a(3) =16a(4) =18a(5) =27a(6) =64a(7) =80a(8) =96a(9) =144a(10) =200a(11) =216a(12) =256a(13) =324a(14) =448a(15) =486a(16) =500a(17) =672a(18) =729a(19) =768a(20) =1008a(21) =1024a(22) =1152a(23) =1250a(24) =1512a(25) =1568a(26) =1728a(27) =2268a(28) =2352a(29) =2560