Odd numbers k such that phi(k) | sigma_3(k).

Terms

a(0) =1a(1) =3a(2) =15a(3) =35a(4) =87a(5) =95a(6) =105a(7) =135a(8) =147a(9) =209a(10) =215a(11) =285a(12) =297a(13) =315a(14) =357a(15) =455a(16) =551a(17) =609a(18) =627a(19) =635a(20) =645a(21) =783a(22) =899a(23) =957a(24) =1015a(25) =1045a(26) =1107a(27) =1211a(28) =1343a(29) =1349