Sum of first a(n) squarefrees is squarefree.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =9a(7) =11a(8) =13a(9) =15a(10) =17a(11) =19a(12) =20a(13) =23a(14) =25a(15) =26a(16) =27a(17) =29a(18) =32a(19) =34a(20) =37a(21) =40a(22) =41a(23) =42a(24) =43a(25) =44a(26) =46a(27) =47a(28) =49a(29) =50