A117841 Start with 1 and repeatedly reverse the digits and add 10 to get the next term.

1, 11, 21, 22, 32, 33, 43, 44, 54, 55, 65, 66, 76, 77, 87, 88, 98, 99, 109, 911, 129, 931, 149, 951, 169, 971, 189, 991, 209, 912, 229, 932, 249, 952, 269, 972, 289, 992, 309, 913, 329, 933, 349, 953, 369, 973, 389, 993, 409, 914, 429, 934, 449, 954, 469, 974, 489, 994, 509

Offset

1,2

Comments

This sequence (unlike A117828, say) never cycles.

The operation can never generate a trailing zero and so is reversible. So it loops only if it returns to the start, which is impossible. - Martin Fuller, May 12 2006

Links

Harvey P. Dale and N. J. A. Sloane, Table of n, a(n) for n = 1..20000 (First 1000 terms from Harvey P. Dale)

N. J. A. Sloane and others, Sequences of RADD type, OEIS wiki.

Mathematica

NestList[FromDigits[Reverse[IntegerDigits[#]]]+10&, 1, 60] (* Harvey P. Dale, May 19 2012 *)

Crossrefs

Cf. A117830, A117828, A117816, A117817.

Sequence in context: A232184 A232185 A118853 * A105956 A178413 A050718

Adjacent sequences: A117838 A117839 A117840 * A117842 A117843 A117844

Keyword

nonn,base

Author

David Applegate, May 05 2006

Status

approved