Numbers k such that phi(k)*k is a triangular number.

Terms

a(0) =1a(1) =3a(2) =15a(3) =84a(4) =217a(5) =255a(6) =1710a(7) =2967a(8) =5363a(9) =11242a(10) =24066a(11) =27370a(12) =29697a(13) =29953a(14) =60977a(15) =65535a(16) =69324a(17) =103257a(18) =159761a(19) =209305a(20) =228333a(21) =446516a(22) =598559a(23) =615410a(24) =691410a(25) =1231305a(26) =1238358a(27) =1365175a(28) =1467732a(29) =1841154