3x+1 sequence starting at 87.

Terms

a(0) =87a(1) =262a(2) =131a(3) =394a(4) =197a(5) =592a(6) =296a(7) =148a(8) =74a(9) =37a(10) =112a(11) =56a(12) =28a(13) =14a(14) =7a(15) =22a(16) =11a(17) =34a(18) =17a(19) =52a(20) =26a(21) =13a(22) =40a(23) =20a(24) =10a(25) =5a(26) =16a(27) =8a(28) =4a(29) =2