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 A322607 #6 Dec 20 2018 23:53:32 %S A322607 1,3080,350350,61850250,17823180375,6871260396000, %T A322607 88909822914869880000,2746644314348614680000, %U A322607 2980109081068246927800000,9638057975990853416623724908800000,424217819372970387341691005411520000,51912228216508515627667235880347808000000,152157812632066726080765311397008321568000000 %N A322607 Numbers that can be expressed as the ratio between the product and the sum of consecutive squarefree numbers starting from 1. %F A322607 a(n) = A111059(A322608(n+1))/A173143(A322608(n+1)). %e A322607 1 is a term because 1/1 = (1*2*3)/(1+2+3) = 1. %e A322607 3080 is a term because (1*2*3*5*6*7*10*11)/(1+2+3+5+6+7+10+11) = 138600/45 = 3080. %p A322607 with(numtheory): P:=proc(q) local a,b,c,n; a:=1; b:=0; c:=[]; %p A322607 for n from 1 to q do if issqrfree(n) then a:=a*n; b:=b+n; %p A322607 if frac(a/b)=0 then if n>1 then c:=[op(c),a/b]; %p A322607 fi; fi; fi; od; op(c); end: P(60); %Y A322607 Cf. A005117, A111059, A116536, A141092, A173143, A322608. %K A322607 nonn,easy %O A322607 1,2 %A A322607 _Paolo P. Lava_, Dec 20 2018