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 A352323 #21 Jan 08 2025 08:35:36
%S A352323 4,9,10,11,16,21,22,23,24,25,26,27,28,33,38,39,40,45,50,51,52,53,54,
%T A352323 55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,74,79,80,81,86,91,92,93,
%U A352323 94,95,96,97,98,103,108,109,110,115,120,121,122,123,124,125,126
%N A352323 Positive numbers that are not the sum of distinct Pell numbers (A000129).
%C A352323 Alternatively, those positive integers whose Pell representation contains no digit 2. - _Jeffrey Shallit_, Jan 08 2025
%H A352323 Amiram Eldar, <a href="/A352323/b352323.txt">Table of n, a(n) for n = 1..10000</a>
%H A352323 L. Carlitz, Richard Scoville, and V. E. Hoggatt, Jr., <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Scanned/10-5/carlitz1.pdf">Pellian Representations</a>, The Fibonacci Quarterly, Vol. 10, No. 5 (1972), pp. 449-488.
%t A352323 pell = LinearRecurrence[{2, 1}, {1, 2}, 7]; Complement[Range[pell[[-1]]], Select[Union[Plus @@@ Subsets[pell]], 0 < # <= pell[[-1]] &]]
%Y A352323 Cf. A000129.
%K A352323 nonn
%O A352323 1,1
%A A352323 _Amiram Eldar_, Mar 12 2022