Primitive abundant numbers k (A071395) whose abundancy index sigma(k)/k has a record low value.

Terms

a(0) =20a(1) =70a(2) =88a(3) =104a(4) =464a(5) =650a(6) =1888a(7) =1952a(8) =4030a(9) =5830a(10) =8925a(11) =17816a(12) =32128a(13) =77744a(14) =91388a(15) =128768a(16) =130304a(17) =442365a(18) =521728a(19) =522752a(20) =1848964a(21) =8353792a(22) =8378368a(23) =8382464a(24) =35021696a(25) =45335936a(26) =120888092a(27) =134193152a(28) =775397948a(29) =1845991216