Amicable quadruples: the numbers b referred to in A036471.

Terms

a(0) =3361680a(1) =4090320a(2) =4839120a(3) =5116320a(4) =5831280a(5) =6029100a(6) =6640200a(7) =6541920a(8) =6922080a(9) =6902280a(10) =7087080a(11) =7436520a(12) =7327320a(13) =7054320a(14) =7722000a(15) =7852320a(16) =8157240a(17) =8157240a(18) =8920800a(19) =9360540a(20) =8759520a(21) =9621360a(22) =10174500a(23) =10174500a(24) =10098000a(25) =10316880a(26) =10085040