A118535 Start with 1 and repeatedly reverse the digits and add 20 to get the next term.

1, 21, 32, 43, 54, 65, 76, 87, 98, 109, 921, 149, 961, 189, 1001, 1021, 1221, 1241, 1441, 1461, 1661, 1681, 1881, 1901, 1111, 1131, 1331, 1351, 1551, 1571, 1771, 1791, 1991, 2011, 1122, 2231, 1342, 2451, 1562, 2671, 1782, 2891, 2002, 2022

Offset: 1

Author

N. J. A. Sloane, May 07 2006

Keywords

• nonn
• base

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000
• N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.

Programs

Mathematica

NestList[IntegerReverse[#]+20&,1,50] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 14 2020 *)

Formula

Never reaches a cycle (see A117816).