A193412 1..9 followed by the canyon numbers A134970.

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

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

Table of n, a(n) for n=1..55.

Example

Illustration using 654356:
  6  .  .  .  .  6
  .  5  .  .  5  .
  .  .  4  .  .  .
  .  .  .  3  .  .

Crossrefs

Cf. A193409, A193413, A134970.

Sequence in context: A050783 A030147 A207954 * A266139 A154562 A193409

Adjacent sequences: A193409 A193410 A193411 * A193413 A193414 A193415

Keyword

nonn,base,fini

Author

Jaroslav Krizek, Jul 25 2011

Status

approved