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 A061708 #20 Dec 03 2023 05:03:00 %S A061708 1,6,36,216,210,7776,46656,1260,1679616,10077696,7560,362797056,44100, %T A061708 18480,78364164096,470184984576,272160,264600,101559956668416,1632960, %U A061708 3656158440062976,21936950640377856,180180,789730223053602816,9261000,58786560,170581728179578208256 %N A061708 Smallest number whose square has (2n - 1)^2 divisors. %C A061708 a(n) <= 6^(n-1); 36^(n-1) has (2n-1)^2 divisors for all n. %H A061708 Amiram Eldar, <a href="/A061708/b061708.txt">Table of n, a(n) for n = 1..68</a> %F A061708 a(n) = Min_{x : d(x^2) = (2n-1)^2}; %F A061708 a(n) = Min_{x : A000005(A000290(x)) = A000290(A005408(n))}. %e A061708 For n = 8, a(8) = 1260 = 2*2*3*3*5*7 and d(1260^2) = d(2*2*2*2*3*3*3*3*5*5*7*7) = 225 = (2*8-1)^2. %e A061708 For n = 14, a(14) = 18480 and d((2*2*2*2*2*2*2*2*3*5*7*11)^2) = 729 = (2*14-1)^2. %Y A061708 Cf. A000005, A000290, A005179, A005408, A016017, A025281, A048691. %K A061708 nonn %O A061708 1,2 %A A061708 _Labos Elemer_, Jun 19 2001 %E A061708 More terms from _David Wasserman_, Jun 24 2002 %E A061708 Edited by _Charlie Neder_, Jun 03 2019 %E A061708 a(26)-a(27) from _Amiram Eldar_, Dec 03 2023