A239090 - OEIS

A239090

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 #8 Jun 09 2016 10:38:48

%S 1,2,3,4,5,6,7,8,9,11,111,1111,11111,111111,1111111,11111111,

%T 111111111,1111111111,11111111111,111111111111,1111111111111,

%U 11111111111111,111111111111111,1111111111111111,11111111111111111,111111111111111111

%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 Sp)

%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