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 A193412 1..9 followed by the canyon numbers A134970. 2

%I #21 Aug 03 2022 02:34:50

%S 1,2,3,4,5,6,7,8,9,101,202,212,303,313,323,404,414,424,434,505,515,

%T 525,535,545,606,616,626,636,646,656,707,717,727,737,747,757,767,808,

%U 818,828,838,848,858,868,878,909,919,929,939,949,959,969,979,989,2012

%N 1..9 followed by the canyon numbers A134970.

%C 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.

%C Superset of crater numbers (A193409). Subset of valley numbers (A193413).

%e Illustration using 654356:

%e 6 . . . . 6

%e . 5 . . 5 .

%e . . 4 . . .

%e . . . 3 . .

%Y Cf. A193409, A193413, A134970.

%K nonn,base,fini

%O 1,2

%A _Jaroslav Krizek_, Jul 25 2011

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Last modified August 5 12:14 EDT 2024. Contains 374950 sequences. (Running on oeis4.)