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A162917
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Numbers n which are not in A161983.
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5
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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
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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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
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LINKS
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Table of n, a(n) for n=1..65.
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FORMULA
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A000027 \ A161983.
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EXAMPLE
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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 odd-indexed terms of A000096.
(End)
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CROSSREFS
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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
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KEYWORD
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nonn,tabf
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AUTHOR
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Juri-Stepan Gerasimov, Jul 17 2009
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EXTENSIONS
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119 removed by R. J. Mathar, Jul 19 2009
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STATUS
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approved
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