A162917 Numbers n which are not in A161983.

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

Offset: 1

Author

Juri-Stepan Gerasimov, Jul 17 2009

Keywords

• nonn
• tabf

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

Examples

			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.

Formula

A000027 \ A161983.

Extensions

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