Integers that are squarefree and also the sum of first k squarefrees for some k.

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =17a(5) =34a(6) =58a(7) =87a(8) =123a(9) =166a(10) =215a(11) =274a(12) =305a(13) =407a(14) =482a(15) =521a(16) =562a(17) =647a(18) =791a(19) =899a(20) =1073a(21) =1261a(22) =1327a(23) =1394a(24) =1463a(25) =1533a(26) =1677a(27) =1751a(28) =1906a(29) =1985