OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
FORMULA
Equals row sums of triangle A143271
EXAMPLE
MAPLE
with(numtheory): seq((1/2)*tau(n)*n*(n+1), n=1..50); # Emeric Deutsch, Aug 16 2008
MATHEMATICA
Table[DivisorSigma[0, n] (n(n+1))/2, {n, 50}] (* Harvey P. Dale, Sep 05 2017 *)
PROG
(PARI) a(n) = numdiv(n)*n*(n+1)/2; \\ Michel Marcus, Mar 11 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Aug 03 2008
EXTENSIONS
Extended by Emeric Deutsch, Aug 16 2008
STATUS
approved