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 A081620 #13 Apr 09 2024 03:25:03 %S A081620 1,4,12,48,144,576,960,1260,3600,82944,46080,184320,2985984,129600, %T A081620 55440,6881280,14745600,58982400,106168320,907200,18662400, %U A081620 247669456896,1321205760,2494800,207360000,45158400,7761600,978447237120,543581798400,2174327193600,1014686023680 %N A081620 Least m with n*(n+1)/2 divisors. %H A081620 Amiram Eldar, <a href="/A081620/b081620.txt">Table of n, a(n) for n = 1..1000</a> %F A081620 A000005(a(n)) = A000217(n) and A000005(k) <> n*(n+1)/2 for k < a(n). %F A081620 a(n) = A005179(A000217(n)) = A005179(n*(n+1)/2). %Y A081620 Subsequence of A081619. %Y A081620 Cf. A000005, A000217, A005179. %K A081620 nonn %O A081620 1,2 %A A081620 _Reinhard Zumkeller_, Mar 24 2003 %E A081620 More terms from _David Wasserman_, Jun 14 2004 %E A081620 a(29)-a(31) from _Amiram Eldar_, Apr 09 2024