A033652 Trajectory of 13 under map x->x + (x-with-digits-reversed).

13, 44, 88, 176, 847, 1595, 7546, 14003, 44044, 88088, 176176, 847847, 1596595, 7553546, 14007103, 44177144, 88354288, 176599676, 853595347, 1597190705, 6668108656, 13236127322, 35608290553, 71117571206

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• base

Comments

To get the next term, reverse the present term and add it to itself.

Examples

			44 = 13 + 31.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..1000
• Index entries for sequences related to Reverse and Add!

Crossrefs

Row n=13 of A243238.

Programs

Mathematica

NestList[#+FromDigits[Reverse[IntegerDigits[#]]]&,13,30] (* Harvey P. Dale, Mar 04 2015 *)

Formula

a(n+1) = a(n) + {a(n) reversed}.