Number of steps until the RADD sequence T(k+1) = n + R(T(k)), T(0) = 1, enters a cycle; -1 if no cycle is ever reached. (R=A004086: reverse digits).

A117816

Number of steps until the RADD sequence T(k+1) = n + R(T(k)), T(0) = 1, enters a cycle; -1 if no cycle is ever reached. (R=A004086: reverse digits).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =-1a(10) =1a(11) =2a(12) =31a(13) =15a(14) =-1a(15) =721a(16) =9a(17) =1a(18) =6a(19) =-1a(20) =3a(21) =5a(22) =28a(23) =29a(24) =131a(25) =23a(26) =1a(27) =31a(28) =6a(29) =-1

External references