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 A147779 #5 Jun 27 2023 09:48:22 %S A147779 6,30,210,330,546,2310,2730,3570,4290,5610,6090,6630,7854,8970,9690, %T A147779 10374,10626,13566,18354,19866,22134,25806,26970,39270,43890,51330, %U A147779 51414,52026,54834,56730,59334,66990,68034,71610,72930,74046,75174 %N A147779 Squarefree positive integers of the form u*v*(u^2-v^2) for some integer u,v. %F A147779 Squarefree terms of A147778. Squarefree terms of A073120. Squarefree terms of A009112. %F A147779 Terms of A006991 (primitive congruent numbers) corresponding to right triangles with integer sides. %Y A147779 Cf. A003273, A006991, A009112, A073120, A147778. %K A147779 nonn %O A147779 1,1 %A A147779 _Max Alekseyev_, Nov 12 2008