OFFSET
1,4
REFERENCES
József Sándor, Dragoslav S. Mitrinovic, and Borislav Crstici, Handbook of Number Theory I, Springer Science & Business Media, 2005, Chapter II, p. 41.
MATHEMATICA
a[n_] := Floor[DivisorSigma[0, n] * Log[n] / 2]; Array[a, 100] (* Amiram Eldar, Apr 07 2024 *)
PROG
(PARI) a(n) = numdiv(n) * log(n) \ 2; \\ Amiram Eldar, Apr 07 2024
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 24 2003
EXTENSIONS
Name corrected by Amiram Eldar, Apr 07 2024
STATUS
approved