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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.

%I A239087 #9 Jun 09 2016 10:38:00
%S A239087 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,
%T A239087 35,44,45,51,16,52,26,53,36,54,46,55,56,61,17,62,27,63,37,64,47,65,57,
%U A239087 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
%N 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.
%C A239087 Computed by Lars Blomberg.
%D A239087 Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013
%H A239087 Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/LittleEqualGreat.htm">Less than <, Equal to =, Greater than ></a> (see sequence Sk)
%H A239087 Eric Angelini, <a href="/A239083/a239083.pdf">Less than <, Equal to =, Greater than ></a> [Cached copy, with permission of the author]
%Y A239087 The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235.
%K A239087 nonn,base
%O A239087 1,2
%A A239087 _N. J. A. Sloane_, Mar 11 2014