Numbers k such that (1,k) is "good".

Terms

a(0) =1a(1) =7a(2) =31a(3) =37a(4) =109a(5) =121a(6) =127a(7) =133a(8) =151a(9) =157a(10) =403a(11) =421a(12) =511a(13) =529a(14) =631a(15) =637a(16) =661a(17) =679a(18) =1579a(19) =1621a(20) =1633a(21) =1969a(22) =1981a(23) =2017a(24) =2041a(25) =2047a(26) =2053a(27) =2071a(28) =2077a(29) =2143