Numbers k where Sum_{d | k} 1/rad(d) increases to a record.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =12a(5) =16a(6) =24a(7) =32a(8) =48a(9) =72a(10) =96a(11) =144a(12) =192a(13) =288a(14) =384a(15) =576a(16) =864a(17) =1152a(18) =1728a(19) =2304a(20) =3456a(21) =4608a(22) =5184a(23) =6912a(24) =10368a(25) =13824a(26) =20736a(27) =27648a(28) =41472a(29) =55296