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A090070
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Numbers n such that there are (presumably) nine palindromes in the Reverse and Add! trajectory of n.
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2
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4, 10, 11, 535, 1000, 1001, 10007, 10101, 20006, 30005, 50003, 60002, 70001, 80000, 80008, 100070, 110060, 120050, 130040, 140030, 150020, 160010, 170000, 170071, 200000, 200002, 1000003, 1000150, 1001001, 1010050, 1100140, 1110040, 1200130
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| For terms < 5000000 each palindrome is reached from the preceding one or from the start in at most 35 steps; after the presumably last one no further palindrome is reached in 2000 steps.
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LINKS
| Index entries for sequences related to Reverse and Add!
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EXAMPLE
| The trajectory of 4 begins 4, 8, 16, 77, 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 4, 8,
77, 1111, 2222, 4444, 8888, 661166 and 3654563 are the nine palindromes in the trajectory of 4 and 4 is a term.
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CROSSREFS
| Cf. A023108, A023109, A065001, A070742, A077594.
Sequence in context: A120261 A101154 A182943 * A078005 A092428 A170943
Adjacent sequences: A090067 A090068 A090069 * A090071 A090072 A090073
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KEYWORD
| nonn,base
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AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 20 2003
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