Numbers k that divide 2*sigma(k).

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =28a(5) =120a(6) =496a(7) =672a(8) =4320a(9) =4680a(10) =8128a(11) =26208a(12) =30240a(13) =32760a(14) =523776a(15) =2178540a(16) =8910720a(17) =17428320a(18) =20427264a(19) =23569920a(20) =33550336a(21) =45532800a(22) =91963648a(23) =142990848a(24) =197064960a(25) =459818240a(26) =1379454720a(27) =1476304896a(28) =8583644160a(29) =8589869056