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 A366028 #5 Oct 02 2023 13:48:50 %S A366028 1,2,4,3,6,12,18,8,16,20,24,36,48,60,72,5,10,30,40,15,45,90,120,80, %T A366028 100,140,160,180,240,300,360,42,54,66,78,84,96,102,108,132,144,156, %U A366028 168,192,204,216,228,150,210,270,330,390,420,450,480,540,600,660,720 %N A366028 Inverse permutation to A366027. %C A366028 For any n > 0, a(n) is a multiple of A271410(n). %H A366028 Rémy Sigrist, <a href="/A366028/a366028.gp.txt">PARI program</a> %H A366028 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A366028 A366027(42) = 32, hence a(32) = 42. %o A366028 (PARI) See Links section. %Y A366028 Cf. A271410, A366027. %K A366028 nonn,base %O A366028 1,2 %A A366028 _Rémy Sigrist_, Sep 26 2023