Number of steps to reach 1 in '3x+1' (or Collatz) problem starting with the n-th Mersenne prime.

Terms

a(0) =7a(1) =16a(2) =106a(3) =46a(4) =158a(5) =224a(6) =177a(7) =450a(8) =860a(9) =1454a(10) =1441a(11) =1660a(12) =6769a(13) =8494a(14) =17094a(15) =29821a(16) =30734a(17) =43478a(18) =55906a(19) =60716a(20) =129608a(21) =134345a(22) =153505a(23) =265860a(24) =293161a(25) =312164a(26) =598067a(27) =1158876a(28) =1482529a(29) =1771117