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

Author

Paul Barry, May 09 2005

Keywords

• nonn

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

Crossrefs

Cf. A000129, A005117, A037918, A107037.

Formula

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

Extensions

More terms from Amiram Eldar, Feb 25 2024