Increasing gaps between 3-smooth numbers (upper end).

Terms

a(0) =2a(1) =6a(2) =12a(3) =16a(4) =24a(5) =48a(6) =96a(7) =128a(8) =192a(9) =288a(10) =324a(11) =384a(12) =576a(13) =648a(14) =729a(15) =864a(16) =972a(17) =1152a(18) =1296a(19) =1458a(20) =1728a(21) =1944a(22) =2592a(23) =2916a(24) =3456a(25) =3888a(26) =5184a(27) =5832a(28) =7776a(29) =10368