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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

%I

%S 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 35,44,45,51,16,52,26,53,36,54,46,55,56,61,17,62,27,63,37,64,47,65,57,

%U 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 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 Computed by Lars Blomberg.

%D Eric Angelini, Posting to Sequence Fans Mailing List, Sep 28 2013

%H Eric Angelini, <a href="http://www.cetteadressecomportecinquantesignes.com/LittleEqualGreat.htm">Less than <, Equal to =, Greater than ></a> (see sequence Sk)

%H Eric Angelini, <a href="/A239083/a239083.pdf">Less than <, Equal to =, Greater than ></a> [Cached copy, with permission of the author]

%Y The sequences in this family are given in A239083-A239086, A239136-A239139, A239087-A239090, A239215-A239218, A239235.

%K nonn,base

%O 1,2

%A _N. J. A. Sloane_, Mar 11 2014

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Last modified August 3 19:39 EDT 2021. Contains 346441 sequences. (Running on oeis4.)