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 A239215 The sequence S = a(1), a(2), ... is defined by a(1)=1, if d,e,f are consecutive digits then we do not have d >= e > f, and S is always extended with the smallest integer not yet present in S. 18
 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22, 23, 24, 25, 26, 27, 28, 29, 33, 34, 35, 36, 37, 38, 39, 44, 45, 46, 47, 48, 49, 55, 56, 57, 58, 59, 66, 67, 68, 69, 77, 78, 79, 88, 89, 99, 999, 9999, 99999, 999999, 9999999, 99999999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Computed by Lars Blomberg. REFERENCES Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013 LINKS Table of n, a(n) for n=1..60. Eric Angelini, Less than <, Equal to =, Greater than > (see sequence Sr) Eric Angelini, Less than <, Equal to =, Greater than > [Cached copy, with permission of the author] MATHEMATICA a[1]=1; a[n_]:=a[n]=Block[{k=1}, While[MemberQ[s=Array[a, n-1], k]||Or@@(#>=#2>#3&@@@Partition[Flatten[IntegerDigits/@Join[Last@s, {k}]], 3, 1]), k++]; k]; Array[a, 56] (* Giorgos Kalogeropoulos, May 13 2022 *) CROSSREFS The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235. Sequence in context: A239016 A102827 A190221 * A055571 A132781 A318275 Adjacent sequences: A239212 A239213 A239214 * A239216 A239217 A239218 KEYWORD nonn,base AUTHOR Michel Marcus, Mar 12 2014 STATUS approved

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Last modified September 13 04:07 EDT 2024. Contains 375859 sequences. (Running on oeis4.)