This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A107040 #11 Feb 25 2024 01:44:29
%S A107040 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,
%T A107040 43,46,47,50,51,53,54,55,57,58,59,61,62,65,66,67,69,71,73,74,78,79,81,
%U A107040 82,83,85,86,87,89,93,94,95,97,99,101,102,103,106,107,109,110
%N A107040 Indices of squarefree Pell numbers.
%C A107040 The associated Pell numbers are 1, 2, 5, 29, 70, 985, 2378, 5741, 33461, 1136689, 2744210, 6625109,... - _R. J. Mathar_, Jan 04 2017
%H A107040 Amiram Eldar, <a href="/A107040/b107040.txt">Table of n, a(n) for n = 1..374</a>
%F A107040 {i: A000129(i) in A005117}. - _R. J. Mathar_, Jan 04 2017
%Y A107040 Cf. A000129, A005117, A037918, A107037.
%K A107040 nonn
%O A107040 1,2
%A A107040 _Paul Barry_, May 09 2005
%E A107040 More terms from _Amiram Eldar_, Feb 25 2024