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a(n) = Product_{d|n, d>1} prime(1+(d mod 12)).
3

%I #5 Oct 08 2018 08:09:20

%S 1,5,7,55,13,595,19,1265,203,2015,37,13090,3,475,637,13915,13,293335,

%T 19,509795,3857,5735,37,602140,39,75,1421,57475,13,28534415,19,320045,

%U 7511,2015,9139,12906740,3,475,147,128978135,13,27866825,19,1450955,535717,5735,37,13247080,57,30225,637,9075,13,34906865,9139,30404275,3857,2015,37

%N a(n) = Product_{d|n, d>1} prime(1+(d mod 12)).

%H Antti Karttunen, <a href="/A320112/b320112.txt">Table of n, a(n) for n = 1..8192</a>

%F a(n) = Product_{d|n, d>1} prime(1+(d mod 12)).

%o (PARI) A320112(n) = { my(m=1); fordiv(n,d,if(d>1, m *= prime(1+(d%12)))); (m); };

%Y Cf. A319985, A320108, A320114, A320116.

%Y Cf. A320113 (rgs-transform).

%K nonn

%O 1,2

%A _Antti Karttunen_, Oct 06 2018