Amicable quadruples: the numbers d referred to in A036471.

Terms

a(0) =3834000a(1) =4240800a(2) =5089392a(3) =5666760a(4) =6939360a(5) =7142100a(6) =7932240a(7) =8076960a(8) =7976160a(9) =8122464a(10) =7738080a(11) =7738920a(12) =8136240a(13) =8136240a(14) =9121680a(15) =9312480a(16) =9368520a(17) =9143820a(18) =10159800a(19) =10260180a(20) =10403820a(21) =10455984a(22) =11179980a(23) =10473120a(24) =10930320a(25) =10794960