A077407 In base 3, records for the number of Reverse and Add! steps needed to reach a palindrome.

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

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: A329545 A187075 A154715 * A273002 A333547 A123702

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