Numbers k for which A019565(2k)-1 is a multiple of A000265(phi(A019565(2k))).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =8a(6) =16a(7) =20a(8) =32a(9) =33a(10) =34a(11) =35a(12) =38a(13) =41a(14) =50a(15) =56a(16) =64a(17) =128a(18) =176a(19) =256a(20) =259a(21) =290a(22) =512a(23) =1024a(24) =2048a(25) =2056a(26) =2081a(27) =2089a(28) =2096a(29) =2180