Numbers n such that sigma(n) = 10*phi(n) (where sigma=A000203, phi=A000010).

Terms

a(0) =168a(1) =270a(2) =570a(3) =2376a(4) =2436a(5) =5016a(6) =6426a(7) =7110a(8) =13566a(9) =15834a(10) =34452a(11) =58520a(12) =62568a(13) =72732a(14) =75210a(15) =113832a(16) =126882a(17) =168756a(18) =169218a(19) =191862a(20) =199368a(21) =223938a(22) =240312a(23) =280488a(24) =308568a(25) =321468a(26) =420888a(27) =449442a(28) =472758a(29) =661848