A067396 a(n) is the position of the n-th occurrence of the pair "2,2" in A067395 (the first difference sequence of A067368).

4, 13, 22, 31, 36, 41, 50, 59, 68, 77, 86, 95, 104, 109, 114, 123, 132, 141, 150, 159, 168, 177, 182, 187, 196, 205, 214, 223, 232, 241, 250, 255, 260, 269, 278, 287, 292, 297, 306, 315, 324, 329, 334, 343, 352, 361, 370, 379, 388, 397, 402, 407, 416, 425

Offset

1,1

Comments

A comparison of this sequence with A067368 suggests the following conjecture: a(n)=2*A067368(n)+n-1. This has been confirmed for several hundred terms.

Above conjecture is true, and it is same as conjecture in Formula section of A067368. - Altug Alkan, Sep 26 2018

Links

Altug Alkan, Table of n, a(n) for n = 1..1000

Example

A067395 begins {4,4,4,2,2,4,4,4,4,...}, so a(1)=4.

Crossrefs

Cf. A067368, A067395, A213258.

Sequence in context: A153193 A304905 A043469 * A017209 A052218 A341005

Adjacent sequences: A067393 A067394 A067395 * A067397 A067398 A067399

Keyword

nonn

Author

John W. Layman, Jan 22 2002

Status

approved