

A090063


Numbers n such that there are (presumably) two palindromes in the Reverse and Add! trajectory of n.


0



49, 58, 67, 76, 85, 94, 108, 118, 127, 133, 143, 148, 153, 173, 177, 178, 198, 207, 217, 226, 239, 247, 276, 277, 279, 297, 306, 316, 325, 331, 338, 339, 341, 346, 349, 351, 371, 375, 376, 378, 379, 396, 405, 415, 419, 430, 437, 438, 440, 445, 448, 450, 464
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OFFSET

1,1


COMMENTS

For terms < 2000 each palindrome is reached from the preceding one or from the start in at most 24 steps; after the presumably last one no further palindrome is reached in 2000 steps.


LINKS

Table of n, a(n) for n=1..53.
Index entries for sequences related to Reverse and Add!


EXAMPLE

The trajectory of 118 begins 118, 929, 1858, 10439, 103840, 152141, 293392, 586784, 1074469, ...; at 1074469 it joins the (presumably) palindromefree trajectory of A063048(72) = 90379, hence 929 and 293392 are the two palindromes in the trajectory of 118 and 118 is a term.


CROSSREFS

Cf. A023108, A023109, A065001, A070742, A077594.
Sequence in context: A044863 A162527 A028915 * A143164 A304950 A316618
Adjacent sequences: A090060 A090061 A090062 * A090064 A090065 A090066


KEYWORD

nonn,base


AUTHOR

Klaus Brockhaus, Nov 20 2003


STATUS

approved



