Number of n-digit numbers in a cycle (including fixed points) under the Kaprekar map A151949.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =10a(5) =9a(6) =8a(7) =12a(8) =16a(9) =22a(10) =14a(11) =42a(12) =18a(13) =73a(14) =29a(15) =125a(16) =34a(17) =199a(18) =38a(19) =308a(20) =49a(21) =462a(22) =71a(23) =665a(24) =105a(25) =920a(26) =161a(27) =1243a(28) =249a(29) =1658