Numbers m such that all elements of the Collatz trajectory occur in the divisors of m.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =64a(7) =80a(8) =128a(9) =160a(10) =256a(11) =320a(12) =512a(13) =640a(14) =1024a(15) =1280a(16) =1344a(17) =2048a(18) =2560a(19) =2688a(20) =4096a(21) =5120a(22) =5376a(23) =8192a(24) =10240a(25) =10752a(26) =16384a(27) =20480a(28) =21504a(29) =21760