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 A239087 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, 21, 13, 22, 23, 31, 14, 32, 24, 33, 34, 41, 15, 42, 25, 43, 35, 44, 45, 51, 16, 52, 26, 53, 36, 54, 46, 55, 56, 61, 17, 62, 27, 63, 37, 64, 47, 65, 57, 66, 67, 71, 18, 72, 28, 73, 38, 74, 48, 75, 58, 76, 68, 77, 78, 81, 19, 82, 29, 83, 39, 84, 49, 85, 59, 86, 69, 87, 79, 88, 89 (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 Eric Angelini, Less than <, Equal to =, Greater than > (see sequence Sk) Eric Angelini, Less than <, Equal to =, Greater than > [Cached copy, with permission of the author] CROSSREFS The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235. Sequence in context: A167620 A169935 A193498 * A095227 A131366 A061487 Adjacent sequences:  A239084 A239085 A239086 * A239088 A239089 A239090 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Mar 11 2014 STATUS approved

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Last modified January 26 14:08 EST 2020. Contains 331280 sequences. (Running on oeis4.)