Nonsquarefree numbers k such that the sum of all nonsquarefree numbers <= k is nonsquarefree.

Terms

a(0) =4a(1) =8a(2) =16a(3) =25a(4) =44a(5) =45a(6) =48a(7) =63a(8) =64a(9) =68a(10) =72a(11) =76a(12) =81a(13) =84a(14) =88a(15) =92a(16) =98a(17) =104a(18) =108a(19) =116a(20) =117a(21) =120a(22) =126a(23) =128a(24) =132a(25) =150a(26) =152a(27) =156a(28) =164a(29) =169