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 A239086 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, 10, 12, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 44, 46, 47, 48, 49, 50, 51, 52, 53, 54, 56, 55, 57, 58, 59, 60, 61, 62, 63, 64, 65, 67, 66, 68 (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..68. Eric Angelini, Less than <, Equal to =, Greater than > (see sequence Se) 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[s[[-2;; ]], {k}]], 3, 1]), k++]; k]; Array[a, 68] (* Giorgos Kalogeropoulos, May 14 2022 *) CROSSREFS The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235. Sequence in context: A132575 A239235 A031297 * A306866 A187769 A357492 Adjacent sequences: A239083 A239084 A239085 * A239087 A239088 A239089 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Mar 10 2014 STATUS approved

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