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 A121457 #5 Jun 02 2025 00:30:04 %S A121457 1,1,2,2,3,6,6,8,6,12,24,24,30,20,40,30,60,120,120,144,90,80,180,120, %T A121457 90,240,180,360,720,720,840,504,420,1008,630,560,420,1260,840,630, %U A121457 1680,1260,2520,5040,5040,5760,3360,2688,2520,6720,4032,3360,2520,2240,8064 %N A121457 a(n) = A096162(n) * A036039(n). %C A121457 Refines A007841 using partitions associated with least prime signatures. %e A121457 The table begins %e A121457 1 %e A121457 1 2 %e A121457 2 3 6 %e A121457 6 8 6 12 24 %e A121457 24 30 20 40 30 60 120 %Y A121457 Cf. A025487 A000041 A036039 A096162 A007841. %K A121457 easy,nonn,tabf %O A121457 1,3 %A A121457 _Alford Arnold_, Jul 31 2006 %E A121457 More terms from Justin Eaton (jeaton2(AT)ashland.edu), Oct 18 2006