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A193412 1..9 followed by the canyon numbers A134970. 2
1, 2, 3, 4, 5, 6, 7, 8, 9, 101, 202, 212, 303, 313, 323, 404, 414, 424, 434, 505, 515, 525, 535, 545, 606, 616, 626, 636, 646, 656, 707, 717, 727, 737, 747, 757, 767, 808, 818, 828, 838, 848, 858, 868, 878, 909, 919, 929, 939, 949, 959, 969, 979, 989, 2012 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
For n > 9 the structure of digits represents an abyss. The first digit is equal to the last digit (1 - 9). The first digits are in decreasing order. The last digits are in increasing order. The numbers only have one smallest digit. This sequence is finite. The final term is 9876543210123456789.
Superset of crater numbers (A193409). Subset of valley numbers (A193413).
LINKS
EXAMPLE
Illustration using 654356:
6 . . . . 6
. 5 . . 5 .
. . 4 . . .
. . . 3 . .
CROSSREFS
Sequence in context: A050783 A030147 A207954 * A266139 A154562 A193409
KEYWORD
nonn,base,fini
AUTHOR
Jaroslav Krizek, Jul 25 2011
STATUS
approved

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Last modified July 13 15:08 EDT 2024. Contains 374284 sequences. (Running on oeis4.)