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 A308260 #14 May 30 2019 16:59:20
%S A308260 1,2,2,6,10,210,22,30030,1870,149226,3910,6469693230,11594,
%T A308260 7420738134810,3215630,741422598,2569288370,32589158477190044730,
%U A308260 28045886,117288381359406970983270,19644868330,4812825965463978,23916676633630,3217644767340672907899084554130
%N A308260 a(n) = Product_{k=1..n, gcd(n,k) = 1} prime(k).
%F A308260 A001221(a(n)) = A000010(n).
%F A308260 a(A000040(n)) = A002110(A006093(n)).
%t A308260 a[n_] := Product[If[GCD[n, k] == 1, Prime[k], 1], {k, 1, n}]; Table[a[n], {n, 0, 23}]
%Y A308260 Cf. A000010, A000040, A001221, A001783, A002110, A005117, A006093, A127413.
%K A308260 nonn
%O A308260 0,2
%A A308260 _Ilya Gutkovskiy_, May 30 2019