A107040 Indices of squarefree Pell numbers.

1, 2, 3, 5, 6, 9, 10, 11, 13, 17, 18, 19, 22, 23, 25, 26, 27, 29, 31, 33, 34, 37, 38, 39, 41, 43, 46, 47, 50, 51, 53, 54, 55, 57, 58, 59, 61, 62, 65, 66, 67, 69, 71, 73, 74, 78, 79, 81, 82, 83, 85, 86, 87, 89, 93, 94, 95, 97, 99, 101, 102, 103, 106, 107, 109, 110

Offset

1,2

Comments

The associated Pell numbers are 1, 2, 5, 29, 70, 985, 2378, 5741, 33461, 1136689, 2744210, 6625109,... - R. J. Mathar, Jan 04 2017

Links

Amiram Eldar, Table of n, a(n) for n = 1..374

Formula

{i: A000129(i) in A005117}. - R. J. Mathar, Jan 04 2017

Crossrefs

Cf. A000129, A005117, A037918, A107037.

Sequence in context: A069861 A047449 A162923 * A045989 A129832 A166687

Adjacent sequences: A107037 A107038 A107039 * A107041 A107042 A107043

Keyword

nonn

Author

Paul Barry, May 09 2005

Extensions

More terms from Amiram Eldar, Feb 25 2024

Status

approved