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 A385603 #15 Aug 03 2025 08:50:58 %S A385603 1,1,1,1,1,1,2,1,2,1,1,1,3,2,2,1,2,2,3,1,4,1,2,1,4,3,4,2,3,2,4,1,4,2, %T A385603 4,2,5,3,6,1,4,4,5,1,7,2,4,1,7,4,6,3,5,4,6,2,8,3,5,2,7,4,10,1,8,4,7,2, %U A385603 8,4,6,2,8,5,11,3,8,6,8,1,11,4,7,4,10,5,10,1,8,7,12,2,12,4,10,1,10,7,13,4,9,6,10,3,16,5,9,4,11,6,14,2,10,8,12,3,17,5,12,2,12 %N A385603 Number of equivalence classes of Hurwitz quaternions of norm n with equivalence by left and right multiplication with units. %C A385603 Equivalence between Hurwitz quaternions q1 and q2 defined here: they are equivalent if units u1 and u2 exist such that q1 = u1* q2*u2. This is a relaxed requirement compared with A055672. %H A385603 R. J. Mathar, <a href="/A385603/a385603.pdf">Java program listing</a> %Y A385603 Cf. A000593 (equivalence defined by q1 = q2*u2), A055672 (primes in A000593). %K A385603 nonn %O A385603 1,7 %A A385603 _R. J. Mathar_, Aug 02 2025