A110410 a(1) = 10, a(n+1) = {a(n) followed by digit reversal(a(n))}/11.

10, 91, 829, 75448, 685898587, 62354417071445326, 566858337013139332941310642858666, 51532576092103575721937331168969696987113273922657630119157623515

Offset

1,1

Comments

a(1) = 10 is chosen because for n = say d <=9, the sequence is trivially d,d,d,d,d,d,...

The next term has 129 digits (From Harvey P. Dale, Feb 20 2011 *)

Links

Table of n, a(n) for n=1..8.

Example

a(2) = 1001/11=91, a(3) = 9119/11=829.

Mathematica

nxt[n_]:=Module[{idn=IntegerDigits[n]}, FromDigits[Join[idn, Reverse[idn]]]/11]
NestList[nxt, 10, 8]  (* Harvey P. Dale, Feb 20 2011 *)

Crossrefs

Sequence in context: A002452 A096261 A015455 * A051789 A343354 A338678

Adjacent sequences: A110407 A110408 A110409 * A110411 A110412 A110413

Keyword

base,easy,nonn

Author

Amarnath Murthy, Jul 30 2005

Extensions

More terms from Joshua Zucker, May 10 2006

Status

approved