Arrange digits of n in decreasing order.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =10a(11) =11a(12) =21a(13) =31a(14) =41a(15) =51a(16) =61a(17) =71a(18) =81a(19) =91a(20) =20a(21) =21a(22) =22a(23) =32a(24) =42a(25) =52a(26) =62a(27) =72a(28) =82a(29) =92