Numbers k such that k <= d(k)^2, where d() = number of divisors (A000005).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =8a(6) =9a(7) =10a(8) =12a(9) =14a(10) =15a(11) =16a(12) =18a(13) =20a(14) =24a(15) =28a(16) =30a(17) =32a(18) =36a(19) =40a(20) =42a(21) =48a(22) =54a(23) =56a(24) =60a(25) =72a(26) =80a(27) =84a(28) =90a(29) =96