Numbers n such that sigma(n) = 13*phi(n) (where sigma=A000203, phi=A000010).

Terms

a(0) =630a(1) =5544a(2) =11160a(3) =18810a(4) =27000a(5) =57000a(6) =80388a(7) =161820a(8) =178020a(9) =182880a(10) =242820a(11) =265608a(12) =388620a(13) =391500a(14) =447678a(15) =465192a(16) =522522a(17) =671760a(18) =690120a(19) =711000a(20) =775170a(21) =826500a(22) =901170a(23) =1051830a(24) =1102290a(25) =1157130a(26) =1418160a(27) =1578330a(28) =1679400a(29) =1812384