OFFSET
1,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..1000
EXAMPLE
a(5) = 14 = (5 + 4 + 0 + 4 + 1), where (5, 4, 0, 4, 1) = row 5 of A128260.
MATHEMATICA
Table[DivisorSigma[0, n]+(n-1)DivisorSigma[0, n-1], {n, 60}] (* Harvey P. Dale, Sep 17 2020 *)
PROG
(PARI) a(n)={numdiv(n) + if(n > 1, (n-1)*numdiv(n-1))} \\ Andrew Howroyd, Aug 09 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Gary W. Adamson, Feb 21 2007
EXTENSIONS
Name changed and terms a(11) and beyond from Andrew Howroyd, Aug 09 2018
STATUS
approved