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 A071159 Integers whose decimal expansion start with 1, do not contain zeros and each successive digit to the right is at most one greater than the previous digit. 8
 1, 11, 12, 111, 112, 121, 122, 123, 1111, 1112, 1121, 1122, 1123, 1211, 1212, 1221, 1222, 1223, 1231, 1232, 1233, 1234, 11111, 11112, 11121, 11122, 11123, 11211, 11212, 11221, 11222, 11223, 11231, 11232, 11233, 11234, 12111, 12112, 12121 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 S. Giraudo, Combinatorial operads from monoids, arXiv preprint arXiv:1306.6938, 2013. See Sect. 3.1.3. MAPLE R[1]:= [1]: for d from 2 to 6 do R[d]:= map(t -> seq(10*t+j, j=1..min((t mod 10)+1, 9)), R[d-1]) od: A:= map(op, [seq(R[d], d=1..6)]); # Robert Israel, Jan 31 2017 MATHEMATICA desQ[n_]:=Module[{idn=IntegerDigits[n]}, idn[[1]]==1&&FreeQ[idn, 0]&&Max[ Differences[ idn]]<2]; Select[Range[13000], desQ] (* Harvey P. Dale, Feb 19 2017 *) CROSSREFS Essentially the same as A071157 but with digits reversed. Corresponding Łukasiewicz words: A071153. Sequence in context: A153070 A193023 A278985 * A231873 A096299 A110382 Adjacent sequences:  A071156 A071157 A071158 * A071160 A071161 A071162 KEYWORD nonn,base AUTHOR Antti Karttunen, May 14 2002 STATUS approved

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Last modified January 17 18:48 EST 2019. Contains 319251 sequences. (Running on oeis4.)