A035034 Numbers k such that k >= d(k)^2, where d(k) is the number of divisors of k.

1, 5, 7, 9, 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

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..10000

Formula

a(n) = n + 52 for n >= 1209. - Amiram Eldar, Aug 29 2020

Mathematica

Select[Range[100], #>=DivisorSigma[0, #]^2&] (* Harvey P. Dale, May 05 2017 *)

Crossrefs

Complement of A034884.

Cf. A000005, A035033, A035035.

Sequence in context: A077153 A031102 A005763 * A065155 A230203 A339910

Adjacent sequences: A035031 A035032 A035033 * A035035 A035036 A035037

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved