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 A171701 #8 Jun 02 2025 02:22:48 %S A171701 3,8,18,24,48,60,120,120,180,336,360,360,720,720,720,840,1260,1440, %T A171701 1680,1680,2520,2520,2520,2520,5040,5040,5040,5040,5040,5040,7560, %U A171701 7560,10080,10080,10080,10080,15120,15120,15120,15120,30160,20160,25200,25200 %N A171701 The first n-fold (at least) intrinsically 2-palindromic number (in base ten). %F A171701 If d'(k) is the number of divisors of k minus 1 for square k and minus 2 for numbers of the form m^2+m, then a(n) is the first k for which d'(k)/2>n-1. %Y A171701 Cf. A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742. %K A171701 nonn,base %O A171701 1,1 %A A171701 _James G. Merickel_, Dec 16 2009