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 A294876 #12 Feb 22 2024 10:42:53 %S A294876 1,2,2,6,2,8,2,18,10,8,2,72,2,8,8,126,2,200,2,72,8,8,2,648,22,8,50,72, %T A294876 2,128,2,882,8,8,8,23400,2,8,8,648,2,128,2,72,200,8,2,31752,34,968,8, %U A294876 72,2,5000,8,648,8,8,2,10368,2,8,200,16758,8,128,2,72,8,128,2,2737800,2,8,968,72,8,128,2,31752,1150,8,2,10368,8,8,8,648,2,80000,8,72 %N A294876 a(n) = Product_{d|n, d>1} prime(gcd(d,n/d)). %H A294876 Antti Karttunen, <a href="/A294876/b294876.txt">Table of n, a(n) for n = 1..16384</a> %F A294876 a(n) = Product_{d|n, d>1} A000040(gcd(d,n/d)). %F A294876 Other identities. For all n >= 1: %F A294876 1+A007814(a(n)) = A034444(n). %F A294876 1+A056239(a(n)) = A055155(n). %F A294876 For n > 1, A061395(a(n)) = A000188(n). %t A294876 A294876[n_] := Product[Prime[GCD[d, n/d]], {d, Rest[Divisors[n]]}]; %t A294876 Array[A294876, 100] (* _Paolo Xausa_, Feb 22 2024 *) %o A294876 (PARI) A294876(n) = { my(m=1); fordiv(n,d,if(d>1, m *= prime(gcd(d,n/d)))); m; }; %Y A294876 Cf. A294877 (rgs-version of this filter). %Y A294876 Cf. A000040, A000188, A034444, A055155. %Y A294876 Cf. also A293442, A293514, A293524. %K A294876 nonn %O A294876 1,2 %A A294876 _Antti Karttunen_, Nov 11 2017