Numbers k such that the trajectory of 3k + 1 under the '3x + 1' map reaches k.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =10a(5) =14a(6) =16a(7) =20a(8) =22a(9) =26a(10) =40a(11) =44a(12) =52a(13) =106a(14) =184a(15) =206a(16) =244a(17) =274a(18) =322a(19) =526a(20) =650a(21) =668a(22) =790a(23) =866a(24) =976a(25) =1154a(26) =1300a(27) =1438a(28) =1732a(29) =1780