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 A229882 #24 Feb 22 2021 03:02:26 %S A229882 2,6,30,42,110,182,210,462,506,870,930,1122,1190,1406,1482,1722,1806, %T A229882 2162,3306,3422,3782,4290,4422,4830,4970,5402,6006,6162,6806,7310, %U A229882 7482,8742,8930,10302,10506,11130,11342,11990,12210,12882,13110,14042,15006,16770,17030 %N A229882 Squarefree oblong numbers. %C A229882 Oblong numbers that are squarefree numbers. %H A229882 Amiram Eldar, <a href="/A229882/b229882.txt">Table of n, a(n) for n = 1..10000</a> %F A229882 Intersection of A002378 and A005117. - _Joerg Arndt_, Oct 03 2013 %F A229882 a(n) = A007674(n)^2 + A007674(n). - _Charles R Greathouse IV_, Oct 04 2013 %t A229882 Select[#*(# + 1) & /@ Range[150], SquareFreeQ] (* _Amiram Eldar_, Feb 22 2021 *) %o A229882 (PARI) for(n=1,1e4,if(issquarefree(n) && issquarefree(n+1), print1(n*(n+1)", "))) \\ _Charles R Greathouse IV_, Mar 18 2014 %Y A229882 Cf. A002378, A005117, A007674, A061304. %K A229882 nonn,easy %O A229882 1,1 %A A229882 _Irina Gerasimova_, Oct 02 2013 %E A229882 Wrong term removed and more terms added by _Amiram Eldar_, Feb 22 2021