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 A181813 #4 Mar 30 2012 17:27:19 %S A181813 1,1,2,2,12,12,360,360,720,720,151200,151200,349272000,349272000, %T A181813 349272000,349272000,10488638160000,10488638160000, %U A181813 5354554667061600000,5354554667061600000,5354554667061600000,5354554667061600000 %N A181813 a(n)=smallest integer that, upon multiplying any integer from 1 to n, produces a member of A025487. %F A181813 If A003418(n) = Product p(i)^e(i), then a(n) = Product A002110(i-1)^e(i). I.e., a(n) = A181811(A003418(n)). %F A181813 a(n) = A181814(n)/A003418(n). %e A181813 For integers k = 1 to 6, 12k (12, 24, 36, 48, 60, 72) is always a member of A025487. 12 is the smallest integer with this property; therefore, a(6) = 12. %Y A181813 All terms belong to A181818. %K A181813 nonn %O A181813 1,3 %A A181813 _Matthew Vandermast_, Nov 30 2010