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 A305984 #5 Jun 16 2018 18:31:38
%S A305984 1,2,2,6,2,8,5,12,4,20,2,72,7,20,8,60,5,32,5,120,20,44,2,432,10,28,20,
%T A305984 300,2,320,11,300,8,50,20,576,11,50,28,3120,2,800,5,264,80,20,5,4320,
%U A305984 55,200,20,1428,2,320,20,1200,50,44,5,17280,5,154,80,1500,28,1760,19,300,8,2000,5,17280,11,44,80,1650,50,448,5,78000,40,68,2
%N A305984 a(n) = Product_{d|n, d>1} prime(A305793(1+d)-1), where A305973(k) records the prime signature of 2k-1.
%H A305984 Antti Karttunen, <a href="/A305984/b305984.txt">Table of n, a(n) for n = 1..8192</a>
%F A305984 a(n) = Product_{d|n, d>1} A008578(A305793(1+d)).
%o A305984 (PARI) A305984(n) = { my(m=1); fordiv(n, d, if((d>1), m *= prime(A305973(1+d)-1))); (m); }; \\ Needs also code from A305973.
%Y A305984 Cf. A305973, A305982, A305985 (rgs-transform).
%K A305984 nonn
%O A305984 1,2
%A A305984 _Antti Karttunen_, Jun 15 2018