|
| |
|
|
A090068
|
|
Numbers n such that there are (presumably) seven palindromes in the Reverse and Add! trajectory of n.
|
|
0
| |
|
|
6, 13, 16, 25, 31, 34, 40, 43, 44, 52, 61, 70, 77, 104, 111, 115, 145, 158, 200, 202, 203, 214, 244, 250, 257, 302, 356, 399, 401, 412, 414, 442, 455, 498, 500, 505, 511, 519, 529, 541, 554, 597, 610, 618, 626, 628, 640, 653, 656, 686, 752, 795, 797, 816, 826
(list; graph; refs; listen; history; 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
| Index entries for sequences related to Reverse and Add!
|
|
|
EXAMPLE
| The trajectory of 25 begins 25, 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 77, 1111,
2222, 4444, 8888, 661166 and 3654563 are the seven palindromes in the trajectory of 25 and 25 is a term.
|
|
|
CROSSREFS
| Cf. A023108, A023109, A065001, A070742, A077594.
Sequence in context: A100205 A140888 A053753 * A070899 A197562 A153696
Adjacent sequences: A090065 A090066 A090067 * A090069 A090070 A090071
|
|
|
KEYWORD
| nonn,base
|
|
|
AUTHOR
| Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Nov 20 2003
|
| |
|
|
