Greatest odd number that requires n Collatz (3x+1) iterations to reach 1, or zero if there is no such number.

A176868

Greatest odd number that requires n Collatz (3x+1) iterations to reach 1, or zero if there is no such number.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =5a(6) =0a(7) =21a(8) =0a(9) =85a(10) =0a(11) =341a(12) =113a(13) =1365a(14) =453a(15) =5461a(16) =1813a(17) =21845a(18) =7281a(19) =87381a(20) =29125a(21) =349525a(22) =116501a(23) =1398101a(24) =466033a(25) =5592405a(26) =1864133a(27) =22369621a(28) =7456533a(29) =89478485

External references