Numbers that are 4-persistent but not 5-persistent.

Terms

a(0) =1053274689a(1) =1089467253a(2) =1253094867a(3) =1267085493a(4) =1268547309a(5) =1269085473a(6) =1273085469a(7) =1308547269a(8) =1308549267a(9) =1326854907a(10) =1327068549a(11) =1328746905a(12) =1450687329a(13) =1450732869a(14) =1450867293a(15) =1450928673a(16) =1452687309a(17) =1452690873a(18) =1452730869a(19) =1453087269a(20) =2508946731