Record number of steps to reach 1 in '3x+1' problem, corresponding to starting values in A033958.

Terms

a(0) =0a(1) =2a(2) =5a(3) =6a(4) =7a(5) =41a(6) =42a(7) =43a(8) =44a(9) =45a(10) =46a(11) =47a(12) =52a(13) =62a(14) =65a(15) =66a(16) =76a(17) =79a(18) =87a(19) =96a(20) =98a(21) =101a(22) =102a(23) =103a(24) =113a(25) =114a(26) =119a(27) =125a(28) =129a(29) =130