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 A348557 #15 Dec 15 2021 23:07:38 %S A348557 30,42,70,90,102,120,154,165,170,180,182,198,210,220,224,230,238,255, %T A348557 264,270,273,285,286,306,308,322,330,340,350,360,374,380,385,399,406, %U A348557 418,420,434,435,442,465,480,486,490,494,495,506,510,518,525,544,546,550,552,558 %N A348557 List of indices k such that A327267(k) is less than A328666(k). %C A348557 It is known that A327267(n) <= A328666(n) for all n. See link. For n up to 6000, the inequality is strict only for 1193 values of n. %C A348557 Indeed, the purpose of A328666 is to give a good upper bound sequence for the sequence A327267, while being much easier to compute. %H A348557 Christopher J. Smyth, <a href="/A348557/b348557.txt">Table of n, a(n) for n = 1..1193</a> %H A348557 Chris Pinner and Chris Smyth, <a href="/A348557/a348557.pdf">Lattices of minimal index in Z^n having an orthogonal basis containing a given vector</a>, preprint, 2021. %e A348557 a(1) = 30 since 30 is the first value of k for which A327267(k) < A328666(k). %Y A348557 Cf. A327267 and A328666. %K A348557 nonn %O A348557 1,1 %A A348557 _Christopher J. Smyth_, Oct 22 2021