Numbers k such that phi(2k-1) < phi(2k), where phi is Euler's totient function A000010.

Terms

a(0) =53a(1) =83a(2) =158a(3) =263a(4) =293a(5) =368a(6) =578a(7) =683a(8) =743a(9) =788a(10) =878a(11) =893a(12) =908a(13) =998a(14) =1073a(15) =1103a(16) =1208a(17) =1238a(18) =1268a(19) =1403a(20) =1418a(21) =1502a(22) =1523a(23) =1658a(24) =1733a(25) =1838a(26) =1943a(27) =1964a(28) =2048a(29) =2063