a(3)-a(11) were from the paper by Pollack and Pomerance.
Table of n, a(n) for n=1..11.
Paul Pollack and Carl Pomerance, Some problems of Erdős on the sum-of-divisors function, Transactions of the American Mathematical Society, Series B Vol. 3, No. 1 (2016), pp. 1-26.
Sequence in context: A198590 A297396 A145958 * A039299 A211114 A159697
Adjacent sequences: A290242 A290243 A290244 * A290246 A290247 A290248
Amiram Eldar, Jul 24 2017