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 A383785 #18 May 23 2025 18:34:28 %S A383785 6,11,14,15,22,23,24,30,33,35,38,42,44,46,47,51,54,55,56,59,60,62,66, %T A383785 69,70,71,77,78,83,86,87,88,92,94,95,96,99,102,105,107,110,114,115, %U A383785 118,119,120,123,126,131,132,134,135,138,140,141,142,143,150,152,154 %N A383785 Numbers not occurring as norms of vectors in any regular planar lattice. %C A383785 The norms of Hurwitz quaternions strictly noncoplanar with the origin and any nonopposing pair of unit Hurwitz quaternions, due to Lagrange's four-square theorem and the complement's representation of every coplanar Hurwitz quaternion norm. - _C. S. Davis_, May 19 2025 %H A383785 C. S. Davis, <a href="/A383785/b383785.txt">Table of n, a(n) for n = 1..7374</a> %Y A383785 Intersection of A022544 and A034020. %Y A383785 Complement of A383784. %Y A383785 Supersequence of A055039. %K A383785 nonn %O A383785 1,1 %A A383785 _C. S. Davis_, May 09 2025