A sieve transform applied to Euler's phi function A000010 starting at 4.

Terms

a(0) =2a(1) =4a(2) =6a(3) =10a(4) =8a(5) =18a(6) =24a(7) =40a(8) =80a(9) =84a(10) =144a(11) =176a(12) =224a(13) =384a(14) =360a(15) =464a(16) =480a(17) =544a(18) =704a(19) =864a(20) =840a(21) =864a(22) =1012a(23) =1184a(24) =1280a(25) =1344a(26) =1320a(27) =1640a(28) =1904a(29) =2016