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A090067 Numbers n such that there are (presumably) six palindromes in the Reverse and Add! trajectory of n. 0
7, 12, 17, 21, 26, 30, 33, 35, 53, 59, 62, 68, 71, 80, 86, 88, 95, 102, 103, 109, 114, 117, 142, 150, 154, 170, 191, 201, 208, 209, 210, 213, 216, 222, 241, 253, 300, 301, 303, 307, 308, 312, 315, 329, 340, 352, 359, 383, 389, 400, 404, 406, 407, 411, 428, 451 (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..56.

Index entries for sequences related to Reverse and Add!

EXAMPLE

The trajectory of 154 begins 154, 605, 1111, 2222, 4444, 8888, 17776, 85547, 160105, 661166, 1322332, 3654563, 7309126, ...; at 7309126 it joins the (presumably) palindrome-free trajectory of A063048(7) = 10577, hence 525, 1551, 5115, 13431, 26862 and 12455421 are the six palindromes in the trajectory of 154 and 154 is a term.

CROSSREFS

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

Sequence in context: A063303 A091215 A261410 * A072354 A091576 A272733

Adjacent sequences:  A090064 A090065 A090066 * A090068 A090069 A090070

KEYWORD

nonn,base

AUTHOR

Klaus Brockhaus, Nov 20 2003

STATUS

approved

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Last modified September 17 06:03 EDT 2021. Contains 347478 sequences. (Running on oeis4.)