

A162917


Numbers n which are not in A161983.


5



1, 2, 6, 7, 8, 9, 15, 16, 17, 18, 19, 20, 28, 29, 30, 31, 32, 33, 34, 35, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 120, 121, 122, 123, 124, 125, 126, 127, 128
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OFFSET

1,2


COMMENTS

They have a block structure: A000384(n) is followed by the next n integers.
Numbers k with the property that the largest Dyck path of the symmetric representation of sigma(k) has a central peak. (Cf. A237593.)  Omar E. Pol, Aug 28 2018
Union of nonzero terms of A000384 and A317303.  Omar E. Pol, Aug 29 2018


LINKS

Table of n, a(n) for n=1..65.


FORMULA

A000027 \ A161983.


EXAMPLE

From Omar E. Pol, Aug 28 2018: (Start)
Also, written as an irregular triangle in which the row lengths are the positive even numbers, the sequence begins:
1, 2;
6, 7, 8, 9;
15, 16, 17, 18, 19, 20;
28, 29, 30, 31, 32, 33, 34, 35;
45, 46, 47, 48, 49, 50, 51, 52, 53, 54;
66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77;
91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104;
...
Row sums give A035328, n >= 1.
Column 1 gives A000384, n >= 1.
Column 2 gives A130883, n >= 1.
Right border gives the positive terms of A014107, also the oddindexed terms of A000096.
(End)


CROSSREFS

Complement of A161983.
Cf. A000096, A000384, A014107, A035328, A130883, A237593, A317303.
Sequence in context: A080780 A138168 A047279 * A250183 A260139 A118471
Adjacent sequences: A162914 A162915 A162916 * A162918 A162919 A162920


KEYWORD

nonn,tabf


AUTHOR

JuriStepan Gerasimov, Jul 17 2009


EXTENSIONS

119 removed by R. J. Mathar, Jul 19 2009


STATUS

approved



