OFFSET
1,2
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
MATHEMATICA
a[n_] := DivisorSigma[0, Floor[(n+1)^2/4]]; Array[a, 100] (* Amiram Eldar, Dec 03 2023 *)
PROG
(PARI) a(n) = numdiv((n+1)^2\4); \\ Amiram Eldar, Dec 03 2023
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Omar E. Pol, Oct 24 2013
STATUS
approved