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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

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 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.)