Betrothed (or quasi-amicable) numbers.

Terms

a(0) =48a(1) =75a(2) =140a(3) =195a(4) =1050a(5) =1575a(6) =1648a(7) =1925a(8) =2024a(9) =2295a(10) =5775a(11) =6128a(12) =8892a(13) =9504a(14) =16587a(15) =20735a(16) =62744a(17) =75495a(18) =186615a(19) =196664a(20) =199760a(21) =206504a(22) =219975a(23) =266000a(24) =309135a(25) =312620a(26) =507759a(27) =526575a(28) =544784a(29) =549219