OFFSET
1,4
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
a[n_] := Ceiling[DivisorSigma[0, n] / 2]^2; Array[a, 100] (* Amiram Eldar, Apr 19 2024 *)
PROG
(PARI) a(n) = (numdiv(n) \/ 2)^2; \\ Amiram Eldar, Apr 19 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 08 2020
STATUS
approved