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A077407
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In base 3, records for the number of Reverse and Add! steps needed to reach a palindrome.
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1
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0, 1, 2, 3, 4, 18, 20, 21, 27, 28, 55, 56, 57, 70
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| RECORDS transform of A077402. Base 3 analogue of A066145 (base 2), A075687 (base 4) and A065199 (base 10). A077406 gives the corresponding starting points.
Probable Lychrel numbers are ignored, the first of which is 103 [From Sean A. Irvine (sairvin(AT)xtra.co.nz), Apr 19 2010]
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LINKS
| Index entries for sequences related to Reverse and Add!
N. J. A. Sloane, Transforms
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EXAMPLE
| Starting with 15, 3 Reverse and Add! steps are needed to reach a palindrome; starting with n < 15, less (at most 2) steps are needed.
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CROSSREFS
| Cf. A065199, A066145, A075687, A077402, A077406.
Sequence in context: A037430 A187075 A154715 * A123702 A067805 A092837
Adjacent sequences: A077404 A077405 A077406 * A077408 A077409 A077410
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KEYWORD
| base,more,nonn
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AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 05 2002
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EXTENSIONS
| a(14) from Sean A. Irvine (sairvin(AT)xtra.co.nz), Apr 19 2010
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