login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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 (list; graph; refs; listen; history; text; internal format)
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 odd-indexed 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

Juri-Stepan Gerasimov, Jul 17 2009

EXTENSIONS

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 12 04:27 EDT 2021. Contains 343810 sequences. (Running on oeis4.)