

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
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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..81.
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 A239083A239086, A239136A239139, A239087A239090, A239215A239218, 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



