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A033670 Reverse and Add! trajectory of 89. 8
89, 187, 968, 1837, 9218, 17347, 91718, 173437, 907808, 1716517, 8872688, 17735476, 85189247, 159487405, 664272356, 1317544822, 3602001953, 7193004016, 13297007933, 47267087164, 93445163438 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The sequence reaches a palindrome at a(24)= 8813200023188 (cf. A033665). - Klaus Brockhaus, Jun 07 2002

REFERENCES

Popular Computing (Calabasas, CA), The 196 Problem, Vol. 3 (No. 30, Sep 1975), page PC30-6. Gives full 25-term trajectory of 89.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..1000

Jason Doucette, World Records

I. Peter, More trajectories

Index entries for sequences related to Reverse and Add!

EXAMPLE

a(3) = 968 because 187 + 781 = 968

MATHEMATICA

NestList[# + FromDigits[Reverse[IntegerDigits[#]]]&, 89, 40] (* Vincenzo Librandi, May 03 2014 *)

CROSSREFS

Sequence in context: A142335 A230168 A325082 * A044421 A044802 A142499

Adjacent sequences:  A033667 A033668 A033669 * A033671 A033672 A033673

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified December 12 09:36 EST 2019. Contains 329953 sequences. (Running on oeis4.)