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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

RECORDS transform of A077402. Base-3 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

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Last modified November 13 15:41 EST 2019. Contains 329106 sequences. (Running on oeis4.)