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

Terms

a(0) =1a(1) =5a(2) =7a(3) =55a(4) =13a(5) =595a(6) =19a(7) =1265a(8) =203a(9) =2015a(10) =37a(11) =13090a(12) =3a(13) =475a(14) =637a(15) =13915a(16) =13a(17) =293335a(18) =19a(19) =509795a(20) =3857a(21) =5735a(22) =37a(23) =602140a(24) =39a(25) =75a(26) =1421a(27) =57475a(28) =13a(29) =28534415