Amicable quadruples: the values of sigma corresponding to A036471-A036474.

Terms

a(0) =13927680a(1) =16248960a(2) =19498752a(3) =21228480a(4) =24373440a(5) =24998400a(6) =27855360a(7) =28304640a(8) =28304640a(9) =29030400a(10) =29030400a(11) =29877120a(12) =29998080a(13) =29998080a(14) =32497920a(15) =33022080a(16) =33868800a(17) =33868800a(18) =37497600a(19) =37739520a(20) =37739520a(21) =38997504a(22) =40884480a(23) =40884480