A072218 Consider the Reverse and Add! problem (cf. A001127); of all the n-digit numbers N which eventually reach a palindrome, pick that number N which takes the greatest number of steps to converge (in case of a tie, pick the smallest N); sequence gives palindrome that is reached.

11, 8813200023188, 8813200023188, 8813200023188, 4668731596684224866951378664, 682049569465550121055564965940286, 555458774083726674580862268085476627380477854555, 555458774083726674580862268085476627380477854555, 1345428953367763125675365555635765213677633598245431

Offset: 1

Author

N. J. A. Sloane, Jul 05 2002

Keywords

• nonn
• hard
• base

Comments

Since we do not even know if 196 eventually converges (see A006960, A023108) for n >= 3 these values are only conjectures.

Links

• Jason Doucette, World records
• Index entries for sequences related to Reverse and Add!

Crossrefs

Cf. A072216, A072217, A001127, A006960, A023108.