A035035 Numbers k such that k > d(k)^2, where d(k) is the number of divisors of k.

5, 7, 11, 13, 17, 19, 21, 22, 23, 25, 26, 27, 29, 31, 33, 34, 35, 37, 38, 39, 41, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 81, 82

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Complement of A035033.

Cf. A000005, A034884, A035034.

Programs

Mathematica

Select[Range[100], DivisorSigma[0, #]^2 < # &] (* Amiram Eldar, Aug 29 2020 *)

Formula

a(n) = n + 54 for n >= 1207. - Amiram Eldar, Aug 29 2020