OFFSET
1,1
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A152678(n)/2.
MATHEMATICA
Select[Table[DivisorSigma[1, n]/2, {n, 1, 70}], IntegerQ](* Ivan Neretin, May 09 2015 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Dec 10 2008
STATUS
approved