Reverse concatenation of distinct digits of all divisors of n in base 10.

Terms

a(0) =1a(1) =21a(2) =31a(3) =421a(4) =51a(5) =6321a(6) =71a(7) =8421a(8) =931a(9) =5210a(10) =1a(11) =64321a(12) =31a(13) =7421a(14) =531a(15) =86421a(16) =71a(17) =986321a(18) =91a(19) =54210a(20) =7321a(21) =21a(22) =321a(23) =864321a(24) =521a(25) =6321a(26) =97321a(27) =87421a(28) =921a(29) =653210