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A072217
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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 number of steps N takes to converge.
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2
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2, 24, 23, 21, 55, 64, 96, 96, 98, 109, 149, 149, 188, 186, 201, 197, 236, 232
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Since we do not even know if 196 eventually converges (see A006960, A023108) for n >= 3 these values are only conjectures.
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LINKS
| Jason Doucette, World records
Index entries for sequences related to Reverse and Add!
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CROSSREFS
| Cf. A072216, A072218, A001127, A006960, A023108.
Sequence in context: A075267 A002743 A055535 * A052686 A064818 A022374
Adjacent sequences: A072214 A072215 A072216 * A072218 A072219 A072220
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KEYWORD
| nonn,hard,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jul 05 2002
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EXTENSIONS
| Corrected and extended by Jason Doucette, Mar 29 2005; Oct 09 2005
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