Numbers whose trajectories under the map x -> A230625(x) never reach a prime.

Terms

a(0) =217a(1) =255a(2) =446a(3) =558a(4) =717a(5) =735a(6) =775a(7) =945a(8) =958a(9) =1007a(10) =1062a(11) =1115a(12) =1269a(13) =1344a(14) =1503a(15) =1984a(16) =2215a(17) =2358a(18) =3003a(19) =3751a(20) =3858a(21) =4131a(22) =4471a(23) =5144a(24) =6174a(25) =6627a(26) =6915a(27) =6923a(28) =7033a(29) =7073