Record number of steps to reach 1 in '3x+1' problem, corresponding to starting values in A006877.

Terms

a(0) =0a(1) =1a(2) =7a(3) =8a(4) =16a(5) =19a(6) =20a(7) =23a(8) =111a(9) =112a(10) =115a(11) =118a(12) =121a(13) =124a(14) =127a(15) =130a(16) =143a(17) =144a(18) =170a(19) =178a(20) =181a(21) =182a(22) =208a(23) =216a(24) =237a(25) =261a(26) =267a(27) =275a(28) =278a(29) =281