

A077407


In base 3, records for the number of Reverse and Add! steps needed to reach a palindrome.


1



0, 1, 2, 3, 4, 18, 20, 21, 27, 28, 55, 56, 57, 70
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OFFSET

1,3


COMMENTS

RECORDS transform of A077402. Base3 analog 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.  Sean A. Irvine, Apr 19 2010


LINKS

Table of n, a(n) for n=1..14.
N. J. A. Sloane, Transforms
Index entries for sequences related to Reverse and Add!


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.


CROSSREFS

Cf. A065199, A066145, A075687, A077402, A077406.
Sequence in context: A037430 A187075 A154715 * A273002 A123702 A265367
Adjacent sequences: A077404 A077405 A077406 * A077408 A077409 A077410


KEYWORD

base,more,nonn


AUTHOR

Klaus Brockhaus, Nov 05 2002


EXTENSIONS

a(14) from Sean A. Irvine, Apr 19 2010


STATUS

approved



