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 A130445 #6 Jul 20 2024 20:08:20
%S A130445 128,137,150,159,161,165,166,169,178,183,185,187,188,194,200,202,206,
%T A130445 207,209,218,221,222,223,225,227,230,233,236,237,238,247,250,254,257,
%U A130445 258,259,260,264,265,266,267,268,270,272,275,276,279,280,282,284,290
%N A130445 Integers in the range [1, 425] not expressible as a difference of the unique optimal Golomb ruler of order 24. See A130444.
%C A130445 This sequence has exactly 149 terms. The union of this with A130446 yields all integers in the range [1,425].
%H A130445 Joseph Biberstine (jrbibers(AT)indiana.edu), May 26 2007, <a href="/A130445/b130445.txt">Table of n, a(n) for n = 1..149</a>
%e A130445 128 is a term of this sequence between there do not exist integers 1 <= i < j <= 425 such that A130444(j) - A130444(i) = 128.
%t A130445 A130444 = {0, 9, 33, 37, 38, 97, 122, 129, 140, 142, 152, 191, 205, 208, 252, 278, 286, 326, 332, 353, 368, 384, 403, 425}; Complement[Range[Last[A130444]], Sort[(A130444[[ #[[1]]]] - A130444[[ #[[2]]]]) & /@ Select[Tuples[Range[24], 2], #[[1]] > #[[2]] &]]]
%Y A130445 Cf. A130444: Main entry. A130446: Integers in [1, 425] expressible as a difference from A130444.
%K A130445 fini,nonn
%O A130445 1,1
%A A130445 Joseph Biberstine (jrbibers(AT)indiana.edu), May 26 2007