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A090064 Numbers n such that there are (presumably) three palindromes in the Reverse and Add! trajectory of n. 0
18, 27, 36, 45, 54, 63, 69, 72, 78, 81, 87, 90, 96, 99, 113, 125, 126, 128, 137, 146, 149, 156, 157, 162, 163, 165, 168, 169, 172, 175, 180, 183, 188, 189, 193, 194, 195, 197, 220, 224, 225, 227, 232, 236, 242, 245, 248, 252, 255, 256, 259, 261, 264, 267, 268 (list; graph; refs; listen; history; text; internal format)
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..55.

Index entries for sequences related to Reverse and Add!

EXAMPLE

The trajectory of 113 begins 113, 424, 848, 1696, 8657, 16225, 68486, 136972, 416603, ...; at 416603 it joins the (presumably) palindrome-free trajectory of A063048(16) = 10735, hence 424, 848 and 68486 are the three palindromes in the trajectory of 113 and 113 is a term.

CROSSREFS

Cf. A023108, A023109, A065001, A070742, A077594.

Sequence in context: A284672 A265738 A151741 * A082804 A262277 A144777

Adjacent sequences:  A090061 A090062 A090063 * A090065 A090066 A090067

KEYWORD

nonn,base

AUTHOR

Klaus Brockhaus, Nov 20 2003

STATUS

approved

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Last modified April 11 11:13 EDT 2021. Contains 342886 sequences. (Running on oeis4.)