Greatest odd number k such that difference between halving and tripling steps in Collatz (3x+1) trajectory of k is n, or 0 if there is no such k.

A222755

Greatest odd number k such that difference between halving and tripling steps in Collatz (3x+1) trajectory of k is n, or 0 if there is no such k.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =5a(4) =0a(5) =21a(6) =17a(7) =85a(8) =113a(9) =341a(10) =453a(11) =1365a(12) =1813a(13) =5461a(14) =7281a(15) =21845a(16) =29125a(17) =87381a(18) =116501a(19) =349525a(20) =466033a(21) =1398101a(22) =1864133a(23) =5592405a(24) =7456533a(25) =22369621a(26) =29826161a(27) =89478485a(28) =119304645a(29) =357913941

External references